java.lang.Object
- org.apache.iotdb.db.wal.node.WALNode

All Implemented Interfaces:

java.lang.AutoCloseable, org.apache.iotdb.consensus.common.DataSet, org.apache.iotdb.consensus.multileader.wal.ConsensusReqReader, FlushListener, IWALNode
```
public class WALNode
extends java.lang.Object
implements IWALNode
```
This class encapsulates IWALBuffer and CheckpointManager. If search is enabled, the order of search index should be protected by the upper layer, and the value should start from 1.

Nested Class Summary
- Nested classes/interfaces inherited from interface org.apache.iotdb.consensus.multileader.wal.ConsensusReqReader
  org.apache.iotdb.consensus.multileader.wal.ConsensusReqReader.ReqIterator
- Nested classes/interfaces inherited from interface org.apache.iotdb.db.engine.flush.FlushListener
  FlushListener.DefaultMemTableFLushListener

Field Summary

Fields
Modifier and Type Field Description

static long DEFAULT_SAFELY_DELETED_SEARCH_INDEX
no multi-leader consensus, all insert nodes can be safely deleted
- Fields inherited from interface org.apache.iotdb.consensus.multileader.wal.ConsensusReqReader
  DEFAULT_SEARCH_INDEX

Constructor Summary

Constructors
Constructor	Description
`WALNode(java.lang.String identifier, java.lang.String logDirectory)`
`WALNode(java.lang.String identifier, java.lang.String logDirectory, long startFileVersion, long startSearchIndex)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`
`void`	`deleteOutdatedFiles()`	Delete outdated .wal files
`long`	`getCurrentSearchIndex()`
`java.io.File`	`getLogDirectory()`
`org.apache.iotdb.consensus.multileader.wal.ConsensusReqReader.ReqIterator`	`getReqIterator(long startIndex)`	This iterator is not concurrency-safe, cannot read the current-writing wal file.
`long`	`getTotalSize()`
`WALFlushListener`	`log(long memTableId, DeleteDataNode deleteDataNode)`	Log DeleteDataNode
`WALFlushListener`	`log(long memTableId, InsertRowNode insertRowNode)`	Log InsertRowNode
`WALFlushListener`	`log(long memTableId, InsertTabletNode insertTabletNode, int start, int end)`	Log InsertTabletNode
`WALFlushListener`	`log(long memTableId, DeletePlan deletePlan)`	Log DeletePlan
`WALFlushListener`	`log(long memTableId, InsertRowPlan insertRowPlan)`	Log InsertRowPlan
`WALFlushListener`	`log(long memTableId, InsertTabletPlan insertTabletPlan, int start, int end)`	Log InsertTabletPlan
`void`	`onMemTableCreated(IMemTable memTable, java.lang.String targetTsFile)`	Callback when memTable created
`void`	`onMemTableFlushed(IMemTable memTable)`
`void`	`onMemTableFlushStarted(IMemTable memTable)`
`void`	`rollWALFile()`
`void`	`setSafelyDeletedSearchIndex(long safelyDeletedSearchIndex)`

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

Field Detail
- DEFAULT_SAFELY_DELETED_SEARCH_INDEX
```
public static final long DEFAULT_SAFELY_DELETED_SEARCH_INDEX
```
  no multi-leader consensus, all insert nodes can be safely deleted
  
  See Also:
  
  Constant Field Values

Constructor Detail

WALNode

public WALNode(java.lang.String identifier,
               java.lang.String logDirectory)
        throws java.io.FileNotFoundException

Throws:: java.io.FileNotFoundException

WALNode

public WALNode(java.lang.String identifier,
               java.lang.String logDirectory,
               long startFileVersion,
               long startSearchIndex)
        throws java.io.FileNotFoundException

Throws:: java.io.FileNotFoundException