AccessController (HBase - Server 0.96.2-hadoop2 API)

java.lang.Object
- org.apache.hadoop.hbase.coprocessor.BaseRegionObserver
- - org.apache.hadoop.hbase.security.access.AccessController

All Implemented Interfaces:

Coprocessor, CoprocessorService, MasterObserver, RegionObserver, RegionServerObserver, AccessControlProtos.AccessControlService.Interface
```
public class AccessController
extends BaseRegionObserver
implements MasterObserver, RegionServerObserver, AccessControlProtos.AccessControlService.Interface, CoprocessorService
```
Provides basic authorization checks for data access and administrative operations.
AccessController performs authorization checks for HBase operations based on:
- the identity of the user performing the operation
- the scope over which the operation is performed, in increasing specificity: global, table, column family, or qualifier
- the type of action being performed (as mapped to Permission.Action values)
If the authorization check fails, an AccessDeniedException will be thrown for the operation.

To perform authorization checks, AccessController relies on the RpcServer being loaded to provide the user identities for remote requests.

The access control lists used for authorization can be manipulated via the exposed AccessControlProtos.AccessControlService Interface implementation, and the associated grant, revoke, and user_permission HBase shell commands.

Nested Class Summary
- Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.Coprocessor
  Coprocessor.State

Field Summary

Fields
Modifier and Type Field and Description

static org.apache.commons.logging.Log LOG
- Fields inherited from interface org.apache.hadoop.hbase.Coprocessor
  PRIORITY_HIGHEST, PRIORITY_LOWEST, PRIORITY_SYSTEM, PRIORITY_USER, VERSION

Fields
Modifier and Type	Field and Description
`static org.apache.commons.logging.Log`	`LOG`

Constructor Summary

Constructors
Constructor and Description

AccessController()

Constructors
Constructor and Description
`AccessController()`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`checkPermissions(RpcController controller, AccessControlProtos.CheckPermissionsRequest request, RpcCallback<AccessControlProtos.CheckPermissionsResponse> done)`
`Service`	`getService()`
`void`	`getUserPermissions(RpcController controller, AccessControlProtos.GetUserPermissionsRequest request, RpcCallback<AccessControlProtos.GetUserPermissionsResponse> done)`
`void`	`grant(RpcController controller, AccessControlProtos.GrantRequest request, RpcCallback<AccessControlProtos.GrantResponse> done)`
`void`	`postAddColumn(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, HColumnDescriptor column)` Called after the new column family has been created.
`void`	`postAddColumnHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, HColumnDescriptor column)` Called after the new column family has been created.
`void`	`postAssign(ObserverContext<MasterCoprocessorEnvironment> c, HRegionInfo regionInfo)` Called after the region assignment has been requested.
`void`	`postBalance(ObserverContext<MasterCoprocessorEnvironment> c, List<RegionPlan> plans)` Called after the balancing plan has been submitted.
`void`	`postBalanceSwitch(ObserverContext<MasterCoprocessorEnvironment> c, boolean oldValue, boolean newValue)` Called after the flag to enable/disable balancing has changed.
`void`	`postCloneSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, HBaseProtos.SnapshotDescription snapshot, HTableDescriptor hTableDescriptor)` Called after a snapshot clone operation has been requested.
`void`	`postCreateNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx, NamespaceDescriptor ns)` Called after the createNamespace operation has been requested.
`void`	`postCreateTable(ObserverContext<MasterCoprocessorEnvironment> c, HTableDescriptor desc, HRegionInfo[] regions)` Called after the createTable operation has been requested.
`void`	`postCreateTableHandler(ObserverContext<MasterCoprocessorEnvironment> c, HTableDescriptor desc, HRegionInfo[] regions)` Called after the createTable operation has been requested.
`void`	`postDelete(ObserverContext<RegionCoprocessorEnvironment> c, Delete delete, WALEdit edit, Durability durability)` Called after the client deletes a value.
`void`	`postDeleteColumn(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, byte[] col)` Called after the column family has been deleted.
`void`	`postDeleteColumnHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, byte[] col)` Called after the column family has been deleted.
`void`	`postDeleteNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx, String namespace)` Called after the deleteNamespace operation has been requested.
`void`	`postDeleteSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, HBaseProtos.SnapshotDescription snapshot)` Called after the delete snapshot operation has been requested.
`void`	`postDeleteTable(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName)` Called after the deleteTable operation has been requested.
`void`	`postDeleteTableHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName)` Called after `HMaster` deletes a table.
`void`	`postDisableTable(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName)` Called after the disableTable operation has been requested.
`void`	`postDisableTableHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName)` Called after the disableTable operation has been requested.
`void`	`postEnableTable(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName)` Called after the enableTable operation has been requested.
`void`	`postEnableTableHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName)` Called after the enableTable operation has been requested.
`void`	`postGetTableDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx, List<HTableDescriptor> descriptors)` Called after a getTableDescriptors request has been processed.
`void`	`postLogReplay(ObserverContext<RegionCoprocessorEnvironment> c)` Called after the log replay on the region is over.
`void`	`postModifyColumn(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, HColumnDescriptor descriptor)` Called after the column family has been updated.
`void`	`postModifyColumnHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, HColumnDescriptor descriptor)` Called after the column family has been updated.
`void`	`postModifyNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx, NamespaceDescriptor ns)` Called after the modifyNamespace operation has been requested.
`void`	`postModifyTable(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, HTableDescriptor htd)` Called after the modifyTable operation has been requested.
`void`	`postModifyTableHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, HTableDescriptor htd)` Called after to modifying a table's properties.
`void`	`postMove(ObserverContext<MasterCoprocessorEnvironment> c, HRegionInfo region, ServerName srcServer, ServerName destServer)` Called after the region move has been requested.
`void`	`postOpen(ObserverContext<RegionCoprocessorEnvironment> c)` Called after the region is reported as open to the master.
`void`	`postPut(ObserverContext<RegionCoprocessorEnvironment> c, Put put, WALEdit edit, Durability durability)` Called after the client stores a value.
`void`	`postRegionOffline(ObserverContext<MasterCoprocessorEnvironment> c, HRegionInfo regionInfo)` Called after the region has been marked offline.
`void`	`postRestoreSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, HBaseProtos.SnapshotDescription snapshot, HTableDescriptor hTableDescriptor)` Called after a snapshot restore operation has been requested.
`void`	`postScannerClose(ObserverContext<RegionCoprocessorEnvironment> c, InternalScanner s)` Called after the client closes a scanner.
`RegionScanner`	`postScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Scan scan, RegionScanner s)` Called after the client opens a new scanner.
`void`	`postSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, HBaseProtos.SnapshotDescription snapshot, HTableDescriptor hTableDescriptor)` Called after the snapshot operation has been requested.
`void`	`postStartMaster(ObserverContext<MasterCoprocessorEnvironment> ctx)` Called immediately after an active master instance has completed initialization.
`void`	`postUnassign(ObserverContext<MasterCoprocessorEnvironment> c, HRegionInfo regionInfo, boolean force)` Called after the region unassignment has been requested.
`void`	`preAddColumn(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, HColumnDescriptor column)` Called prior to adding a new column family to the table.
`void`	`preAddColumnHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, HColumnDescriptor column)` Called prior to adding a new column family to the table.
`Result`	`preAppend(ObserverContext<RegionCoprocessorEnvironment> c, Append append)` Called before Append
`void`	`preAssign(ObserverContext<MasterCoprocessorEnvironment> c, HRegionInfo regionInfo)` Called prior to assigning a specific region.
`void`	`preBalance(ObserverContext<MasterCoprocessorEnvironment> c)` Called prior to requesting rebalancing of the cluster regions, though after the initial checks for regions in transition and the balance switch flag.
`boolean`	`preBalanceSwitch(ObserverContext<MasterCoprocessorEnvironment> c, boolean newValue)` Called prior to modifying the flag used to enable/disable region balancing.
`void`	`preBulkLoadHFile(ObserverContext<RegionCoprocessorEnvironment> ctx, List<Pair<byte[],String>> familyPaths)` Verifies user has WRITE privileges on the Column Families involved in the bulkLoadHFile request.
`boolean`	`preCheckAndDelete(ObserverContext<RegionCoprocessorEnvironment> c, byte[] row, byte[] family, byte[] qualifier, CompareFilter.CompareOp compareOp, ByteArrayComparable comparator, Delete delete, boolean result)` Called before checkAndDelete
`boolean`	`preCheckAndPut(ObserverContext<RegionCoprocessorEnvironment> c, byte[] row, byte[] family, byte[] qualifier, CompareFilter.CompareOp compareOp, ByteArrayComparable comparator, Put put, boolean result)` Called before checkAndPut
`void`	`preCleanupBulkLoad(RegionCoprocessorEnvironment e)` Authorization security check for SecureBulkLoadProtocol.cleanupBulkLoad()
`void`	`preCloneSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, HBaseProtos.SnapshotDescription snapshot, HTableDescriptor hTableDescriptor)` Called before a snapshot is cloned.
`void`	`preClose(ObserverContext<RegionCoprocessorEnvironment> e, boolean abortRequested)` Called before the region is reported as closed to the master.
`InternalScanner`	`preCompact(ObserverContext<RegionCoprocessorEnvironment> e, Store store, InternalScanner scanner, ScanType scanType)` Called prior to writing the `StoreFile`s selected for compaction into a new `StoreFile`.
`void`	`preCompactSelection(ObserverContext<RegionCoprocessorEnvironment> e, Store store, List<StoreFile> candidates)` Called prior to selecting the `StoreFile`s to compact from the list of available candidates.
`void`	`preCreateNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx, NamespaceDescriptor ns)` Called before a new namespace is created by `HMaster`.
`void`	`preCreateTable(ObserverContext<MasterCoprocessorEnvironment> c, HTableDescriptor desc, HRegionInfo[] regions)` Called before a new table is created by `HMaster`.
`void`	`preCreateTableHandler(ObserverContext<MasterCoprocessorEnvironment> c, HTableDescriptor desc, HRegionInfo[] regions)` Called before a new table is created by `HMaster`.
`void`	`preDelete(ObserverContext<RegionCoprocessorEnvironment> c, Delete delete, WALEdit edit, Durability durability)` Called before the client deletes a value.
`void`	`preDeleteColumn(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, byte[] col)` Called prior to deleting the entire column family.
`void`	`preDeleteColumnHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, byte[] col)` Called prior to deleting the entire column family.
`void`	`preDeleteNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx, String namespace)` Called before `HMaster` deletes a namespace It can't bypass the default action, e.g., ctx.bypass() won't have effect.
`void`	`preDeleteSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, HBaseProtos.SnapshotDescription snapshot)` Called before a snapshot is deleted.
`void`	`preDeleteTable(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName)` Called before `HMaster` deletes a table.
`void`	`preDeleteTableHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName)` Called before `HMaster` deletes a table.
`void`	`preDisableTable(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName)` Called prior to disabling a table.
`void`	`preDisableTableHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName)` Called prior to disabling a table.
`void`	`preEnableTable(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName)` Called prior to enabling a table.
`void`	`preEnableTableHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName)` Called prior to enabling a table.
`boolean`	`preExists(ObserverContext<RegionCoprocessorEnvironment> c, Get get, boolean exists)` Called before the client tests for existence using a Get.
`void`	`preFlush(ObserverContext<RegionCoprocessorEnvironment> e)` Called before the memstore is flushed to disk.
`void`	`preGetClosestRowBefore(ObserverContext<RegionCoprocessorEnvironment> c, byte[] row, byte[] family, Result result)` Called before a client makes a GetClosestRowBefore request.
`void`	`preGetOp(ObserverContext<RegionCoprocessorEnvironment> c, Get get, List<Cell> result)` Called before the client performs a Get
`void`	`preGetTableDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx, List<TableName> tableNamesList, List<HTableDescriptor> descriptors)` Called before a getTableDescriptors request has been processed.
`Result`	`preIncrement(ObserverContext<RegionCoprocessorEnvironment> c, Increment increment)` Called before Increment
`long`	`preIncrementColumnValue(ObserverContext<RegionCoprocessorEnvironment> c, byte[] row, byte[] family, byte[] qualifier, long amount, boolean writeToWAL)` Called before incrementColumnValue
`void`	`preMasterInitialization(ObserverContext<MasterCoprocessorEnvironment> ctx)` Call before the master initialization is set to true.
`void`	`preModifyColumn(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, HColumnDescriptor descriptor)` Called prior to modifying a column family's attributes.
`void`	`preModifyColumnHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, HColumnDescriptor descriptor)` Called prior to modifying a column family's attributes.
`void`	`preModifyNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx, NamespaceDescriptor ns)` Called prior to modifying a namespace's properties.
`void`	`preModifyTable(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, HTableDescriptor htd)` Called prior to modifying a table's properties.
`void`	`preModifyTableHandler(ObserverContext<MasterCoprocessorEnvironment> c, TableName tableName, HTableDescriptor htd)` Called prior to modifying a table's properties.
`void`	`preMove(ObserverContext<MasterCoprocessorEnvironment> c, HRegionInfo region, ServerName srcServer, ServerName destServer)` Called prior to moving a given region from one region server to another.
`void`	`preOpen(ObserverContext<RegionCoprocessorEnvironment> e)` Called before the region is reported as open to the master.
`void`	`prePrepareBulkLoad(RegionCoprocessorEnvironment e)` Authorization check for SecureBulkLoadProtocol.prepareBulkLoad()
`void`	`prePut(ObserverContext<RegionCoprocessorEnvironment> c, Put put, WALEdit edit, Durability durability)` Called before the client stores a value.
`void`	`preRegionOffline(ObserverContext<MasterCoprocessorEnvironment> c, HRegionInfo regionInfo)` Called prior to marking a given region as offline.
`void`	`preRestoreSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, HBaseProtos.SnapshotDescription snapshot, HTableDescriptor hTableDescriptor)` Called before a snapshot is restored.
`void`	`preScannerClose(ObserverContext<RegionCoprocessorEnvironment> c, InternalScanner s)` Called before the client closes a scanner.
`boolean`	`preScannerNext(ObserverContext<RegionCoprocessorEnvironment> c, InternalScanner s, List<Result> result, int limit, boolean hasNext)` Called before the client asks for the next row on a scanner.
`RegionScanner`	`preScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Scan scan, RegionScanner s)` Called before the client opens a new scanner.
`void`	`preShutdown(ObserverContext<MasterCoprocessorEnvironment> c)` Called prior to shutting down the full HBase cluster, including this `HMaster` process.
`void`	`preSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx, HBaseProtos.SnapshotDescription snapshot, HTableDescriptor hTableDescriptor)` Called before a new snapshot is taken.
`void`	`preSplit(ObserverContext<RegionCoprocessorEnvironment> e)` Called before the region is split.
`void`	`preSplit(ObserverContext<RegionCoprocessorEnvironment> e, byte[] splitRow)` Called before the region is split.
`void`	`preStopMaster(ObserverContext<MasterCoprocessorEnvironment> c)` Called immediately prior to stopping this `HMaster` process.
`void`	`preStopRegionServer(ObserverContext<RegionServerCoprocessorEnvironment> env)` Called before stopping region server.
`void`	`preUnassign(ObserverContext<MasterCoprocessorEnvironment> c, HRegionInfo regionInfo, boolean force)` Called prior to unassigning a given region.
`void`	`revoke(RpcController controller, AccessControlProtos.RevokeRequest request, RpcCallback<AccessControlProtos.RevokeResponse> done)`
`void`	`start(CoprocessorEnvironment env)`
`void`	`stop(CoprocessorEnvironment env)`

Methods inherited from class org.apache.hadoop.hbase.coprocessor.BaseRegionObserver
postAppend, postBatchMutate, postBulkLoadHFile, postCheckAndDelete, postCheckAndPut, postClose, postCompact, postCompact, postCompactSelection, postCompactSelection, postCompleteSplit, postExists, postFlush, postFlush, postGet, postGetClosestRowBefore, postGetOp, postIncrement, postIncrementColumnValue, postRollBackSplit, postScannerFilterRow, postScannerNext, postSplit, postWALRestore, preBatchMutate, preCompact, preCompactScannerOpen, preCompactScannerOpen, preCompactSelection, preFlush, preFlushScannerOpen, preGet, preRollBackSplit, preStoreScannerOpen, preWALRestore

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - LOG
```
public static final org.apache.commons.logging.Log LOG
```
- Constructor Detail
  - AccessController
```
public AccessController()
```
- Method Detail
  - start
```
public void start(CoprocessorEnvironment env)
           throws IOException
```
    Specified by:
    
    start in interface Coprocessor
    
    Overrides:
    
    start in class BaseRegionObserver
    
    Throws:
    
    IOException
  - stop
```
public void stop(CoprocessorEnvironment env)
```
    Specified by:
    
    stop in interface Coprocessor
    
    Overrides:
    
    stop in class BaseRegionObserver
  - preCreateTable
```
public void preCreateTable(ObserverContext<MasterCoprocessorEnvironment> c,
                  HTableDescriptor desc,
                  HRegionInfo[] regions)
                    throws IOException
```
    Description copied from interface: MasterObserver
    
    Called before a new table is created by HMaster. Called as part of create table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preCreateTable in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    desc - the HTableDescriptor for the table
    regions - the initial regions created for the table
    
    Throws:
    
    IOException
  - preCreateTableHandler
```
public void preCreateTableHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                         HTableDescriptor desc,
                         HRegionInfo[] regions)
                           throws IOException
```
    Description copied from interface: MasterObserver
    
    Called before a new table is created by HMaster. Called as part of create table handler and it is async to the create RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preCreateTableHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    desc - the HTableDescriptor for the table
    regions - the initial regions created for the table
    
    Throws:
    
    IOException
  - postCreateTable
```
public void postCreateTable(ObserverContext<MasterCoprocessorEnvironment> c,
                   HTableDescriptor desc,
                   HRegionInfo[] regions)
                     throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the createTable operation has been requested. Called as part of create table RPC call.
    
    Specified by:
    
    postCreateTable in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    desc - the HTableDescriptor for the table
    regions - the initial regions created for the table
    
    Throws:
    
    IOException
  - postCreateTableHandler
```
public void postCreateTableHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                          HTableDescriptor desc,
                          HRegionInfo[] regions)
                            throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the createTable operation has been requested. Called as part of create table RPC call. Called as part of create table handler and it is async to the create RPC call.
    
    Specified by:
    
    postCreateTableHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    desc - the HTableDescriptor for the table
    regions - the initial regions created for the table
    
    Throws:
    
    IOException
  - preDeleteTable
```
public void preDeleteTable(ObserverContext<MasterCoprocessorEnvironment> c,
                  TableName tableName)
                    throws IOException
```
    Description copied from interface: MasterObserver
    
    Called before HMaster deletes a table. Called as part of delete table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preDeleteTable in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    
    Throws:
    
    IOException
  - preDeleteTableHandler
```
public void preDeleteTableHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                         TableName tableName)
                           throws IOException
```
    Description copied from interface: MasterObserver
    
    Called before HMaster deletes a table. Called as part of delete table handler and it is async to the delete RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preDeleteTableHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    
    Throws:
    
    IOException
  - postDeleteTable
```
public void postDeleteTable(ObserverContext<MasterCoprocessorEnvironment> c,
                   TableName tableName)
                     throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the deleteTable operation has been requested. Called as part of delete table RPC call.
    
    Specified by:
    
    postDeleteTable in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    
    Throws:
    
    IOException
  - postDeleteTableHandler
```
public void postDeleteTableHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                          TableName tableName)
                            throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after HMaster deletes a table. Called as part of delete table handler and it is async to the delete RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    postDeleteTableHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    
    Throws:
    
    IOException
  - preModifyTable
```
public void preModifyTable(ObserverContext<MasterCoprocessorEnvironment> c,
                  TableName tableName,
                  HTableDescriptor htd)
                    throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to modifying a table's properties. Called as part of modify table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preModifyTable in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    htd - the HTableDescriptor
    
    Throws:
    
    IOException
  - preModifyTableHandler
```
public void preModifyTableHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                         TableName tableName,
                         HTableDescriptor htd)
                           throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to modifying a table's properties. Called as part of modify table handler and it is async to the modify table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preModifyTableHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    htd - the HTableDescriptor
    
    Throws:
    
    IOException
  - postModifyTable
```
public void postModifyTable(ObserverContext<MasterCoprocessorEnvironment> c,
                   TableName tableName,
                   HTableDescriptor htd)
                     throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the modifyTable operation has been requested. Called as part of modify table RPC call.
    
    Specified by:
    
    postModifyTable in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    htd - the HTableDescriptor
    
    Throws:
    
    IOException
  - postModifyTableHandler
```
public void postModifyTableHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                          TableName tableName,
                          HTableDescriptor htd)
                            throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after to modifying a table's properties. Called as part of modify table handler and it is async to the modify table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    postModifyTableHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    htd - the HTableDescriptor
    
    Throws:
    
    IOException
  - preAddColumn
```
public void preAddColumn(ObserverContext<MasterCoprocessorEnvironment> c,
                TableName tableName,
                HColumnDescriptor column)
                  throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to adding a new column family to the table. Called as part of add column RPC call.
    
    Specified by:
    
    preAddColumn in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    column - the HColumnDescriptor
    
    Throws:
    
    IOException
  - preAddColumnHandler
```
public void preAddColumnHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                       TableName tableName,
                       HColumnDescriptor column)
                         throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to adding a new column family to the table. Called as part of add column handler.
    
    Specified by:
    
    preAddColumnHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    column - the HColumnDescriptor
    
    Throws:
    
    IOException
  - postAddColumn
```
public void postAddColumn(ObserverContext<MasterCoprocessorEnvironment> c,
                 TableName tableName,
                 HColumnDescriptor column)
                   throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the new column family has been created. Called as part of add column RPC call.
    
    Specified by:
    
    postAddColumn in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    column - the HColumnDescriptor
    
    Throws:
    
    IOException
  - postAddColumnHandler
```
public void postAddColumnHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                        TableName tableName,
                        HColumnDescriptor column)
                          throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the new column family has been created. Called as part of add column handler.
    
    Specified by:
    
    postAddColumnHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    column - the HColumnDescriptor
    
    Throws:
    
    IOException
  - preModifyColumn
```
public void preModifyColumn(ObserverContext<MasterCoprocessorEnvironment> c,
                   TableName tableName,
                   HColumnDescriptor descriptor)
                     throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to modifying a column family's attributes. Called as part of modify column RPC call.
    
    Specified by:
    
    preModifyColumn in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    descriptor - the HColumnDescriptor
    
    Throws:
    
    IOException
  - preModifyColumnHandler
```
public void preModifyColumnHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                          TableName tableName,
                          HColumnDescriptor descriptor)
                            throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to modifying a column family's attributes. Called as part of modify column handler.
    
    Specified by:
    
    preModifyColumnHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    descriptor - the HColumnDescriptor
    
    Throws:
    
    IOException
  - postModifyColumn
```
public void postModifyColumn(ObserverContext<MasterCoprocessorEnvironment> c,
                    TableName tableName,
                    HColumnDescriptor descriptor)
                      throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the column family has been updated. Called as part of modify column RPC call.
    
    Specified by:
    
    postModifyColumn in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    descriptor - the HColumnDescriptor
    
    Throws:
    
    IOException
  - postModifyColumnHandler
```
public void postModifyColumnHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                           TableName tableName,
                           HColumnDescriptor descriptor)
                             throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the column family has been updated. Called as part of modify column handler.
    
    Specified by:
    
    postModifyColumnHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    descriptor - the HColumnDescriptor
    
    Throws:
    
    IOException
  - preDeleteColumn
```
public void preDeleteColumn(ObserverContext<MasterCoprocessorEnvironment> c,
                   TableName tableName,
                   byte[] col)
                     throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to deleting the entire column family. Called as part of delete column RPC call.
    
    Specified by:
    
    preDeleteColumn in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    col - the column
    
    Throws:
    
    IOException
  - preDeleteColumnHandler
```
public void preDeleteColumnHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                          TableName tableName,
                          byte[] col)
                            throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to deleting the entire column family. Called as part of delete column handler.
    
    Specified by:
    
    preDeleteColumnHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    col - the column
    
    Throws:
    
    IOException
  - postDeleteColumn
```
public void postDeleteColumn(ObserverContext<MasterCoprocessorEnvironment> c,
                    TableName tableName,
                    byte[] col)
                      throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the column family has been deleted. Called as part of delete column RPC call.
    
    Specified by:
    
    postDeleteColumn in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    col - the column
    
    Throws:
    
    IOException
  - postDeleteColumnHandler
```
public void postDeleteColumnHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                           TableName tableName,
                           byte[] col)
                             throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the column family has been deleted. Called as part of delete column handler.
    
    Specified by:
    
    postDeleteColumnHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    col - the column
    
    Throws:
    
    IOException
  - preEnableTable
```
public void preEnableTable(ObserverContext<MasterCoprocessorEnvironment> c,
                  TableName tableName)
                    throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to enabling a table. Called as part of enable table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preEnableTable in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    
    Throws:
    
    IOException
  - preEnableTableHandler
```
public void preEnableTableHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                         TableName tableName)
                           throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to enabling a table. Called as part of enable table handler and it is async to the enable table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preEnableTableHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    
    Throws:
    
    IOException
  - postEnableTable
```
public void postEnableTable(ObserverContext<MasterCoprocessorEnvironment> c,
                   TableName tableName)
                     throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the enableTable operation has been requested. Called as part of enable table RPC call.
    
    Specified by:
    
    postEnableTable in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    
    Throws:
    
    IOException
  - postEnableTableHandler
```
public void postEnableTableHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                          TableName tableName)
                            throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the enableTable operation has been requested. Called as part of enable table handler and it is async to the enable table RPC call.
    
    Specified by:
    
    postEnableTableHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    
    Throws:
    
    IOException
  - preDisableTable
```
public void preDisableTable(ObserverContext<MasterCoprocessorEnvironment> c,
                   TableName tableName)
                     throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to disabling a table. Called as part of disable table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preDisableTable in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    
    Throws:
    
    IOException
  - preDisableTableHandler
```
public void preDisableTableHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                          TableName tableName)
                            throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to disabling a table. Called as part of disable table handler and it is asyn to the disable table RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preDisableTableHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    
    Throws:
    
    IOException
  - postDisableTable
```
public void postDisableTable(ObserverContext<MasterCoprocessorEnvironment> c,
                    TableName tableName)
                      throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the disableTable operation has been requested. Called as part of disable table RPC call.
    
    Specified by:
    
    postDisableTable in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    
    Throws:
    
    IOException
  - postDisableTableHandler
```
public void postDisableTableHandler(ObserverContext<MasterCoprocessorEnvironment> c,
                           TableName tableName)
                             throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the disableTable operation has been requested. Called as part of disable table handler and it is asyn to the disable table RPC call.
    
    Specified by:
    
    postDisableTableHandler in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    tableName - the name of the table
    
    Throws:
    
    IOException
  - preMove
```
public void preMove(ObserverContext<MasterCoprocessorEnvironment> c,
           HRegionInfo region,
           ServerName srcServer,
           ServerName destServer)
             throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to moving a given region from one region server to another.
    
    Specified by:
    
    preMove in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    region - the HRegionInfo
    srcServer - the source ServerName
    destServer - the destination ServerName
    
    Throws:
    
    IOException
  - postMove
```
public void postMove(ObserverContext<MasterCoprocessorEnvironment> c,
            HRegionInfo region,
            ServerName srcServer,
            ServerName destServer)
              throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the region move has been requested.
    
    Specified by:
    
    postMove in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    region - the HRegionInfo
    srcServer - the source ServerName
    destServer - the destination ServerName
    
    Throws:
    
    IOException
  - preAssign
```
public void preAssign(ObserverContext<MasterCoprocessorEnvironment> c,
             HRegionInfo regionInfo)
               throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to assigning a specific region.
    
    Specified by:
    
    preAssign in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    regionInfo - the regionInfo of the region
    
    Throws:
    
    IOException
  - postAssign
```
public void postAssign(ObserverContext<MasterCoprocessorEnvironment> c,
              HRegionInfo regionInfo)
                throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the region assignment has been requested.
    
    Specified by:
    
    postAssign in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    regionInfo - the regionInfo of the region
    
    Throws:
    
    IOException
  - preUnassign
```
public void preUnassign(ObserverContext<MasterCoprocessorEnvironment> c,
               HRegionInfo regionInfo,
               boolean force)
                 throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to unassigning a given region.
    
    Specified by:
    
    preUnassign in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    force - whether to force unassignment or not
    
    Throws:
    
    IOException
  - postUnassign
```
public void postUnassign(ObserverContext<MasterCoprocessorEnvironment> c,
                HRegionInfo regionInfo,
                boolean force)
                  throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the region unassignment has been requested.
    
    Specified by:
    
    postUnassign in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    force - whether to force unassignment or not
    
    Throws:
    
    IOException
  - preRegionOffline
```
public void preRegionOffline(ObserverContext<MasterCoprocessorEnvironment> c,
                    HRegionInfo regionInfo)
                      throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to marking a given region as offline. ctx.bypass() will not have any impact on this hook.
    
    Specified by:
    
    preRegionOffline in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    
    Throws:
    
    IOException
  - postRegionOffline
```
public void postRegionOffline(ObserverContext<MasterCoprocessorEnvironment> c,
                     HRegionInfo regionInfo)
                       throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the region has been marked offline.
    
    Specified by:
    
    postRegionOffline in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    
    Throws:
    
    IOException
  - preBalance
```
public void preBalance(ObserverContext<MasterCoprocessorEnvironment> c)
                throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to requesting rebalancing of the cluster regions, though after the initial checks for regions in transition and the balance switch flag.
    
    Specified by:
    
    preBalance in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    
    Throws:
    
    IOException
  - postBalance
```
public void postBalance(ObserverContext<MasterCoprocessorEnvironment> c,
               List<RegionPlan> plans)
                 throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the balancing plan has been submitted.
    
    Specified by:
    
    postBalance in interface MasterObserver
    
    Parameters:
    c - the environment to interact with the framework and master
    plans - the RegionPlans which master has executed. RegionPlan serves as hint as for the final destination for the underlying region but may not represent the final state of assignment
    
    Throws:
    
    IOException
  - preBalanceSwitch
```
public boolean preBalanceSwitch(ObserverContext<MasterCoprocessorEnvironment> c,
                       boolean newValue)
                         throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to modifying the flag used to enable/disable region balancing.
    
    Specified by:
    
    preBalanceSwitch in interface MasterObserver
    
    Parameters:
    c - the coprocessor instance's environment
    newValue - the new flag value submitted in the call
    
    Throws:
    
    IOException
  - postBalanceSwitch
```
public void postBalanceSwitch(ObserverContext<MasterCoprocessorEnvironment> c,
                     boolean oldValue,
                     boolean newValue)
                       throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the flag to enable/disable balancing has changed.
    
    Specified by:
    
    postBalanceSwitch in interface MasterObserver
    
    Parameters:
    c - the coprocessor instance's environment
    oldValue - the previously set balanceSwitch value
    newValue - the newly set balanceSwitch value
    
    Throws:
    
    IOException
  - preShutdown
```
public void preShutdown(ObserverContext<MasterCoprocessorEnvironment> c)
                 throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to shutting down the full HBase cluster, including this HMaster process.
    
    Specified by:
    
    preShutdown in interface MasterObserver
    
    Throws:
    
    IOException
  - preStopMaster
```
public void preStopMaster(ObserverContext<MasterCoprocessorEnvironment> c)
                   throws IOException
```
    Description copied from interface: MasterObserver
    
    Called immediately prior to stopping this HMaster process.
    
    Specified by:
    
    preStopMaster in interface MasterObserver
    
    Throws:
    
    IOException
  - postStartMaster
```
public void postStartMaster(ObserverContext<MasterCoprocessorEnvironment> ctx)
                     throws IOException
```
    Description copied from interface: MasterObserver
    
    Called immediately after an active master instance has completed initialization. Will not be called on standby master instances unless they take over the active role.
    
    Specified by:
    
    postStartMaster in interface MasterObserver
    
    Throws:
    
    IOException
  - preMasterInitialization
```
public void preMasterInitialization(ObserverContext<MasterCoprocessorEnvironment> ctx)
                             throws IOException
```
    Description copied from interface: MasterObserver
    
    Call before the master initialization is set to true. HMaster process.
    
    Specified by:
    
    preMasterInitialization in interface MasterObserver
    
    Throws:
    
    IOException
  - preSnapshot
```
public void preSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
               HBaseProtos.SnapshotDescription snapshot,
               HTableDescriptor hTableDescriptor)
                 throws IOException
```
    Description copied from interface: MasterObserver
    
    Called before a new snapshot is taken. Called as part of snapshot RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preSnapshot in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor for the snapshot
    hTableDescriptor - the hTableDescriptor of the table to snapshot
    
    Throws:
    
    IOException
  - postSnapshot
```
public void postSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                HBaseProtos.SnapshotDescription snapshot,
                HTableDescriptor hTableDescriptor)
                  throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the snapshot operation has been requested. Called as part of snapshot RPC call.
    
    Specified by:
    
    postSnapshot in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor for the snapshot
    hTableDescriptor - the hTableDescriptor of the table to snapshot
    
    Throws:
    
    IOException
  - preCloneSnapshot
```
public void preCloneSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                    HBaseProtos.SnapshotDescription snapshot,
                    HTableDescriptor hTableDescriptor)
                      throws IOException
```
    Description copied from interface: MasterObserver
    
    Called before a snapshot is cloned. Called as part of restoreSnapshot RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preCloneSnapshot in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor for the snapshot
    hTableDescriptor - the hTableDescriptor of the table to create
    
    Throws:
    
    IOException
  - postCloneSnapshot
```
public void postCloneSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     HBaseProtos.SnapshotDescription snapshot,
                     HTableDescriptor hTableDescriptor)
                       throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after a snapshot clone operation has been requested. Called as part of restoreSnapshot RPC call.
    
    Specified by:
    
    postCloneSnapshot in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor for the snapshot
    hTableDescriptor - the hTableDescriptor of the table to create
    
    Throws:
    
    IOException
  - preRestoreSnapshot
```
public void preRestoreSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                      HBaseProtos.SnapshotDescription snapshot,
                      HTableDescriptor hTableDescriptor)
                        throws IOException
```
    Description copied from interface: MasterObserver
    
    Called before a snapshot is restored. Called as part of restoreSnapshot RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preRestoreSnapshot in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor for the snapshot
    hTableDescriptor - the hTableDescriptor of the table to restore
    
    Throws:
    
    IOException
  - postRestoreSnapshot
```
public void postRestoreSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                       HBaseProtos.SnapshotDescription snapshot,
                       HTableDescriptor hTableDescriptor)
                         throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after a snapshot restore operation has been requested. Called as part of restoreSnapshot RPC call.
    
    Specified by:
    
    postRestoreSnapshot in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor for the snapshot
    hTableDescriptor - the hTableDescriptor of the table to restore
    
    Throws:
    
    IOException
  - preDeleteSnapshot
```
public void preDeleteSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                     HBaseProtos.SnapshotDescription snapshot)
                       throws IOException
```
    Description copied from interface: MasterObserver
    
    Called before a snapshot is deleted. Called as part of deleteSnapshot RPC call. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preDeleteSnapshot in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor of the snapshot to delete
    
    Throws:
    
    IOException
  - postDeleteSnapshot
```
public void postDeleteSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
                      HBaseProtos.SnapshotDescription snapshot)
                        throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the delete snapshot operation has been requested. Called as part of deleteSnapshot RPC call.
    
    Specified by:
    
    postDeleteSnapshot in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    snapshot - the SnapshotDescriptor of the snapshot to delete
    
    Throws:
    
    IOException
  - preCreateNamespace
```
public void preCreateNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
                      NamespaceDescriptor ns)
                        throws IOException
```
    Description copied from interface: MasterObserver
    
    Called before a new namespace is created by HMaster. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preCreateNamespace in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    ns - the NamespaceDescriptor for the table
    
    Throws:
    
    IOException
  - postCreateNamespace
```
public void postCreateNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
                       NamespaceDescriptor ns)
                         throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the createNamespace operation has been requested.
    
    Specified by:
    
    postCreateNamespace in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    ns - the NamespaceDescriptor for the table
    
    Throws:
    
    IOException
  - preDeleteNamespace
```
public void preDeleteNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
                      String namespace)
                        throws IOException
```
    Description copied from interface: MasterObserver
    
    Called before HMaster deletes a namespace It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preDeleteNamespace in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    namespace - the name of the namespace
    
    Throws:
    
    IOException
  - postDeleteNamespace
```
public void postDeleteNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
                       String namespace)
                         throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the deleteNamespace operation has been requested.
    
    Specified by:
    
    postDeleteNamespace in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    namespace - the name of the namespace
    
    Throws:
    
    IOException
  - preModifyNamespace
```
public void preModifyNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
                      NamespaceDescriptor ns)
                        throws IOException
```
    Description copied from interface: MasterObserver
    
    Called prior to modifying a namespace's properties. It can't bypass the default action, e.g., ctx.bypass() won't have effect.
    
    Specified by:
    
    preModifyNamespace in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    ns - the NamespaceDescriptor
    
    Throws:
    
    IOException
  - postModifyNamespace
```
public void postModifyNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
                       NamespaceDescriptor ns)
                         throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after the modifyNamespace operation has been requested.
    
    Specified by:
    
    postModifyNamespace in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    ns - the NamespaceDescriptor
    
    Throws:
    
    IOException
  - preOpen
```
public void preOpen(ObserverContext<RegionCoprocessorEnvironment> e)
             throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the region is reported as open to the master.
    
    Specified by:
    
    preOpen in interface RegionObserver
    
    Overrides:
    
    preOpen in class BaseRegionObserver
    
    Parameters:
    e - the environment provided by the region server
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postOpen
```
public void postOpen(ObserverContext<RegionCoprocessorEnvironment> c)
```
    Description copied from interface: RegionObserver
    
    Called after the region is reported as open to the master.
    
    Specified by:
    
    postOpen in interface RegionObserver
    
    Overrides:
    
    postOpen in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
  - postLogReplay
```
public void postLogReplay(ObserverContext<RegionCoprocessorEnvironment> c)
```
    Description copied from interface: RegionObserver
    
    Called after the log replay on the region is over.
    
    Specified by:
    
    postLogReplay in interface RegionObserver
    
    Overrides:
    
    postLogReplay in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
  - preFlush
```
public void preFlush(ObserverContext<RegionCoprocessorEnvironment> e)
              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the memstore is flushed to disk.
    
    Specified by:
    
    preFlush in interface RegionObserver
    
    Overrides:
    
    preFlush in class BaseRegionObserver
    
    Parameters:
    e - the environment provided by the region server
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preSplit
```
public void preSplit(ObserverContext<RegionCoprocessorEnvironment> e)
              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the region is split.
    
    Specified by:
    
    preSplit in interface RegionObserver
    
    Overrides:
    
    preSplit in class BaseRegionObserver
    
    Parameters:
    e - the environment provided by the region server (e.getRegion() returns the parent region)
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preSplit
```
public void preSplit(ObserverContext<RegionCoprocessorEnvironment> e,
            byte[] splitRow)
              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the region is split.
    
    Specified by:
    
    preSplit in interface RegionObserver
    
    Overrides:
    
    preSplit in class BaseRegionObserver
    
    Parameters:
    e - the environment provided by the region server (e.getRegion() returns the parent region)
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preCompact
```
public InternalScanner preCompact(ObserverContext<RegionCoprocessorEnvironment> e,
                         Store store,
                         InternalScanner scanner,
                         ScanType scanType)
                           throws IOException
```
    Description copied from interface: RegionObserver
    Called prior to writing the StoreFiles selected for compaction into a new StoreFile. To override or modify the compaction process, implementing classes have two options:
    - Wrap the provided InternalScanner with a custom implementation that is returned from this method. The custom scanner can then inspect KeyValues from the wrapped scanner, applying its own policy to what gets written.
    - Call ObserverContext.bypass() and provide a custom implementation for writing of new StoreFiles. Note: any implementations bypassing core compaction using this approach must write out new store files themselves or the existing data will no longer be available after compaction.
    Specified by:
    
    preCompact in interface RegionObserver
    
    Overrides:
    
    preCompact in class BaseRegionObserver
    
    Parameters:
    e - the environment provided by the region server
    store - the store being compacted
    scanner - the scanner over existing data used in the store file rewriting
    scanType - type of Scan
    
    Returns:
    the scanner to use during compaction. Should not be null unless the implementation is writing new store files on its own.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preCompactSelection
```
public void preCompactSelection(ObserverContext<RegionCoprocessorEnvironment> e,
                       Store store,
                       List<StoreFile> candidates)
                         throws IOException
```
    Description copied from interface: RegionObserver
    
    Called prior to selecting the StoreFiles to compact from the list of available candidates. To alter the files used for compaction, you may mutate the passed in list of candidates.
    
    Specified by:
    
    preCompactSelection in interface RegionObserver
    
    Overrides:
    
    preCompactSelection in class BaseRegionObserver
    
    Parameters:
    e - the environment provided by the region server
    store - the store where compaction is being requested
    candidates - the store files currently available for compaction
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preGetClosestRowBefore
```
public void preGetClosestRowBefore(ObserverContext<RegionCoprocessorEnvironment> c,
                          byte[] row,
                          byte[] family,
                          Result result)
                            throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before a client makes a GetClosestRowBefore request.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preGetClosestRowBefore in interface RegionObserver
    
    Overrides:
    
    preGetClosestRowBefore in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    row - the row
    family - the family
    result - The result to return to the client if default processing is bypassed. Can be modified. Will not be used if default processing is not bypassed.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preGetOp
```
public void preGetOp(ObserverContext<RegionCoprocessorEnvironment> c,
            Get get,
            List<Cell> result)
              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client performs a Get
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preGetOp in interface RegionObserver
    
    Overrides:
    
    preGetOp in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    get - the Get request
    result - The result to return to the client if default processing is bypassed. Can be modified. Will not be used if default processing is not bypassed.
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preExists
```
public boolean preExists(ObserverContext<RegionCoprocessorEnvironment> c,
                Get get,
                boolean exists)
                  throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client tests for existence using a Get.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preExists in interface RegionObserver
    
    Overrides:
    
    preExists in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    get - the Get request
    
    Returns:
    the value to return to the client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - prePut
```
public void prePut(ObserverContext<RegionCoprocessorEnvironment> c,
          Put put,
          WALEdit edit,
          Durability durability)
            throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client stores a value.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    prePut in interface RegionObserver
    
    Overrides:
    
    prePut in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    put - The Put object
    edit - The WALEdit object that will be written to the wal
    durability - Persistence guarantee for this Put
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postPut
```
public void postPut(ObserverContext<RegionCoprocessorEnvironment> c,
           Put put,
           WALEdit edit,
           Durability durability)
```
    Description copied from interface: RegionObserver
    
    Called after the client stores a value.
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postPut in interface RegionObserver
    
    Overrides:
    
    postPut in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    put - The Put object
    edit - The WALEdit object for the wal
    durability - Persistence guarantee for this Put
  - preDelete
```
public void preDelete(ObserverContext<RegionCoprocessorEnvironment> c,
             Delete delete,
             WALEdit edit,
             Durability durability)
               throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client deletes a value.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preDelete in interface RegionObserver
    
    Overrides:
    
    preDelete in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    delete - The Delete object
    edit - The WALEdit object for the wal
    durability - Persistence guarantee for this Delete
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postDelete
```
public void postDelete(ObserverContext<RegionCoprocessorEnvironment> c,
              Delete delete,
              WALEdit edit,
              Durability durability)
                throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the client deletes a value.
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postDelete in interface RegionObserver
    
    Overrides:
    
    postDelete in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    delete - The Delete object
    edit - The WALEdit object for the wal
    durability - Persistence guarantee for this Delete
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preCheckAndPut
```
public boolean preCheckAndPut(ObserverContext<RegionCoprocessorEnvironment> c,
                     byte[] row,
                     byte[] family,
                     byte[] qualifier,
                     CompareFilter.CompareOp compareOp,
                     ByteArrayComparable comparator,
                     Put put,
                     boolean result)
                       throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before checkAndPut
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preCheckAndPut in interface RegionObserver
    
    Overrides:
    
    preCheckAndPut in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    row - row to check
    family - column family
    qualifier - column qualifier
    compareOp - the comparison operation
    comparator - the comparator
    put - data to put if check succeeds
    
    Returns:
    the return value to return to client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preCheckAndDelete
```
public boolean preCheckAndDelete(ObserverContext<RegionCoprocessorEnvironment> c,
                        byte[] row,
                        byte[] family,
                        byte[] qualifier,
                        CompareFilter.CompareOp compareOp,
                        ByteArrayComparable comparator,
                        Delete delete,
                        boolean result)
                          throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before checkAndDelete
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preCheckAndDelete in interface RegionObserver
    
    Overrides:
    
    preCheckAndDelete in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    row - row to check
    family - column family
    qualifier - column qualifier
    compareOp - the comparison operation
    comparator - the comparator
    delete - delete to commit if check succeeds
    
    Returns:
    the value to return to client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preIncrementColumnValue
```
public long preIncrementColumnValue(ObserverContext<RegionCoprocessorEnvironment> c,
                           byte[] row,
                           byte[] family,
                           byte[] qualifier,
                           long amount,
                           boolean writeToWAL)
                             throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before incrementColumnValue
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preIncrementColumnValue in interface RegionObserver
    
    Overrides:
    
    preIncrementColumnValue in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    row - row to check
    family - column family
    qualifier - column qualifier
    amount - long amount to increment
    writeToWAL - true if the change should be written to the WAL
    
    Returns:
    value to return to the client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preAppend
```
public Result preAppend(ObserverContext<RegionCoprocessorEnvironment> c,
               Append append)
                 throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before Append
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preAppend in interface RegionObserver
    
    Overrides:
    
    preAppend in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    append - Append object
    
    Returns:
    result to return to the client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preIncrement
```
public Result preIncrement(ObserverContext<RegionCoprocessorEnvironment> c,
                  Increment increment)
                    throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before Increment
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preIncrement in interface RegionObserver
    
    Overrides:
    
    preIncrement in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    increment - increment object
    
    Returns:
    result to return to the client if bypassing default processing
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preScannerOpen
```
public RegionScanner preScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c,
                           Scan scan,
                           RegionScanner s)
                             throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client opens a new scanner.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preScannerOpen in interface RegionObserver
    
    Overrides:
    
    preScannerOpen in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    scan - the Scan specification
    s - if not null, the base scanner
    
    Returns:
    an RegionScanner instance to use instead of the base scanner if overriding default behavior, null otherwise
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postScannerOpen
```
public RegionScanner postScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c,
                            Scan scan,
                            RegionScanner s)
                              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the client opens a new scanner.
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postScannerOpen in interface RegionObserver
    
    Overrides:
    
    postScannerOpen in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    scan - the Scan specification
    s - if not null, the base scanner
    
    Returns:
    the scanner instance to use
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preScannerNext
```
public boolean preScannerNext(ObserverContext<RegionCoprocessorEnvironment> c,
                     InternalScanner s,
                     List<Result> result,
                     int limit,
                     boolean hasNext)
                       throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client asks for the next row on a scanner.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preScannerNext in interface RegionObserver
    
    Overrides:
    
    preScannerNext in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    s - the scanner
    result - The result to return to the client if default processing is bypassed. Can be modified. Will not be returned if default processing is not bypassed.
    limit - the maximum number of results to return
    hasNext - the 'has more' indication
    
    Returns:
    'has more' indication that should be sent to client
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preScannerClose
```
public void preScannerClose(ObserverContext<RegionCoprocessorEnvironment> c,
                   InternalScanner s)
                     throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the client closes a scanner.
    Call CoprocessorEnvironment#bypass to skip default actions
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    preScannerClose in interface RegionObserver
    
    Overrides:
    
    preScannerClose in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    s - the scanner
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - postScannerClose
```
public void postScannerClose(ObserverContext<RegionCoprocessorEnvironment> c,
                    InternalScanner s)
                      throws IOException
```
    Description copied from interface: RegionObserver
    
    Called after the client closes a scanner.
    Call CoprocessorEnvironment#complete to skip any subsequent chained coprocessors
    
    Specified by:
    
    postScannerClose in interface RegionObserver
    
    Overrides:
    
    postScannerClose in class BaseRegionObserver
    
    Parameters:
    c - the environment provided by the region server
    s - the scanner
    
    Throws:
    
    IOException - if an error occurred on the coprocessor
  - preBulkLoadHFile
```
public void preBulkLoadHFile(ObserverContext<RegionCoprocessorEnvironment> ctx,
                    List<Pair<byte[],String>> familyPaths)
                      throws IOException
```
    Verifies user has WRITE privileges on the Column Families involved in the bulkLoadHFile request. Specific Column Write privileges are presently ignored.
    
    Specified by:
    
    preBulkLoadHFile in interface RegionObserver
    
    Overrides:
    
    preBulkLoadHFile in class BaseRegionObserver
    
    familyPaths - pairs of { CF, HFile path } submitted for bulk load. Adding or removing from this list will add or remove HFiles to be bulk loaded.
    
    Throws:
    
    IOException
  - prePrepareBulkLoad
```
public void prePrepareBulkLoad(RegionCoprocessorEnvironment e)
                        throws IOException
```
    Authorization check for SecureBulkLoadProtocol.prepareBulkLoad()
    
    Parameters:
    e -
    
    Throws:
    
    IOException
  - preCleanupBulkLoad
```
public void preCleanupBulkLoad(RegionCoprocessorEnvironment e)
                        throws IOException
```
    Authorization security check for SecureBulkLoadProtocol.cleanupBulkLoad()
    
    Parameters:
    e -
    
    Throws:
    
    IOException
  - grant
```
public void grant(RpcController controller,
         AccessControlProtos.GrantRequest request,
         RpcCallback<AccessControlProtos.GrantResponse> done)
```
    Specified by:
    
    grant in interface AccessControlProtos.AccessControlService.Interface
  - revoke
```
public void revoke(RpcController controller,
          AccessControlProtos.RevokeRequest request,
          RpcCallback<AccessControlProtos.RevokeResponse> done)
```
    Specified by:
    
    revoke in interface AccessControlProtos.AccessControlService.Interface
  - getUserPermissions
```
public void getUserPermissions(RpcController controller,
                      AccessControlProtos.GetUserPermissionsRequest request,
                      RpcCallback<AccessControlProtos.GetUserPermissionsResponse> done)
```
    Specified by:
    
    getUserPermissions in interface AccessControlProtos.AccessControlService.Interface
  - checkPermissions
```
public void checkPermissions(RpcController controller,
                    AccessControlProtos.CheckPermissionsRequest request,
                    RpcCallback<AccessControlProtos.CheckPermissionsResponse> done)
```
    Specified by:
    
    checkPermissions in interface AccessControlProtos.AccessControlService.Interface
  - getService
```
public Service getService()
```
    Specified by:
    
    getService in interface CoprocessorService
  - preClose
```
public void preClose(ObserverContext<RegionCoprocessorEnvironment> e,
            boolean abortRequested)
              throws IOException
```
    Description copied from interface: RegionObserver
    
    Called before the region is reported as closed to the master.
    
    Specified by:
    
    preClose in interface RegionObserver
    
    Overrides:
    
    preClose in class BaseRegionObserver
    
    Parameters:
    e - the environment provided by the region server
    abortRequested - true if the region server is aborting
    
    Throws:
    
    IOException
  - preStopRegionServer
```
public void preStopRegionServer(ObserverContext<RegionServerCoprocessorEnvironment> env)
                         throws IOException
```
    Description copied from interface: RegionServerObserver
    
    Called before stopping region server.
    
    Specified by:
    
    preStopRegionServer in interface RegionServerObserver
    
    Parameters:
    env - An instance of RegionServerCoprocessorEnvironment
    
    Throws:
    
    IOException - Signals that an I/O exception has occurred.
  - preGetTableDescriptors
```
public void preGetTableDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx,
                          List<TableName> tableNamesList,
                          List<HTableDescriptor> descriptors)
                            throws IOException
```
    Description copied from interface: MasterObserver
    
    Called before a getTableDescriptors request has been processed.
    
    Specified by:
    
    preGetTableDescriptors in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    tableNamesList - the list of table names, or null if querying for all
    descriptors - an empty list, can be filled with what to return if bypassing
    
    Throws:
    
    IOException
  - postGetTableDescriptors
```
public void postGetTableDescriptors(ObserverContext<MasterCoprocessorEnvironment> ctx,
                           List<HTableDescriptor> descriptors)
                             throws IOException
```
    Description copied from interface: MasterObserver
    
    Called after a getTableDescriptors request has been processed.
    
    Specified by:
    
    postGetTableDescriptors in interface MasterObserver
    
    Parameters:
    ctx - the environment to interact with the framework and master
    descriptors - the list of descriptors about to be returned
    
    Throws:
    
    IOException

Class AccessController

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.Coprocessor

Field Summary

Fields inherited from interface org.apache.hadoop.hbase.Coprocessor

Constructor Summary

Method Summary

Methods inherited from class org.apache.hadoop.hbase.coprocessor.BaseRegionObserver

Methods inherited from class java.lang.Object

Field Detail

LOG

Constructor Detail

AccessController

Method Detail

start

stop

preCreateTable

preCreateTableHandler

postCreateTable

postCreateTableHandler

preDeleteTable

preDeleteTableHandler

postDeleteTable

postDeleteTableHandler

preModifyTable

preModifyTableHandler

postModifyTable

postModifyTableHandler

preAddColumn

preAddColumnHandler

postAddColumn

postAddColumnHandler

preModifyColumn

preModifyColumnHandler

postModifyColumn

postModifyColumnHandler

preDeleteColumn

preDeleteColumnHandler

postDeleteColumn

postDeleteColumnHandler

preEnableTable

preEnableTableHandler

postEnableTable

postEnableTableHandler

preDisableTable

preDisableTableHandler

postDisableTable

postDisableTableHandler

preMove

postMove

preAssign

postAssign

preUnassign

postUnassign

preRegionOffline

postRegionOffline

preBalance

postBalance

preBalanceSwitch

postBalanceSwitch

preShutdown

preStopMaster

postStartMaster

preMasterInitialization

preSnapshot

postSnapshot

preCloneSnapshot

postCloneSnapshot

preRestoreSnapshot

postRestoreSnapshot

preDeleteSnapshot

postDeleteSnapshot

preCreateNamespace

postCreateNamespace

preDeleteNamespace

postDeleteNamespace

preModifyNamespace

postModifyNamespace

preOpen

postOpen