org.apache.hadoop.hive.metastore

Interface IMetaStoreMetadataTransformer

All Known Implementing Classes:

MetastoreDefaultTransformer

@InterfaceAudience.Public
 @InterfaceStability.Evolving
public interface IMetaStoreMetadataTransformer

This interface provides a way for users to implement a custom metadata transformer for tables/partitions. This transformer can match and manipulate the data to be returned to the data processor The classes implementing this interface should be in the HMS classpath, if this configuration is turned on.

Method Summary

Modifier and Type	Method and Description
Map<Table,List<String>>	transform(List<Table> tables, List<String> processorCapabilities, String processorId)
Table	transformAlterTable(Table oldTable, Table newTable, List<String> processorCapabilities, String processorId)
Table	transformCreateTable(Table table, List<String> processorCapabilities, String processorId)
Database	transformDatabase(Database db, List<String> processorCapabilities, String processorId)
List<Partition>	transformPartitions(List<Partition> parts, Table table, List<String> processorCapabilities, String processorId)

Method Detail

transform

Map<Table,List<String>> transform(List<Table> tables,
                                  List<String> processorCapabilities,
                                  String processorId)
                           throws MetaException

Parameters:

tables - A list of tables to be transformed.

processorCapabilities - A array of String capabilities received from the data processor

processorId - String ID used for logging purpose.

Returns:

Map A Map of transformed objects keyed by Table and value is list of required capabilities

Throws:

MetaException

transformPartitions

List<Partition> transformPartitions(List<Partition> parts,
                                    Table table,
                                    List<String> processorCapabilities,
                                    String processorId)
                             throws MetaException

Parameters:

parts - A list of Partition objects to be transformed

processorCapabilities - A array of String capabilities received from the data processor

processorId - String ID used for logging purpose.

Returns:

Map A Map of transformed objects keyed by Partition and value is list of required capabilities

Throws:

MetaException

transformCreateTable

Table transformCreateTable(Table table,
                           List<String> processorCapabilities,
                           String processorId)
                    throws MetaException

Parameters:

table - A table object to be transformed prior to the creation of the table

processorCapabilities - A array of String capabilities received from the data processor

processorId - String ID used for logging purpose.

Returns:

Table An altered Table based on the processor capabilities

Throws:

MetaException

transformDatabase

Database transformDatabase(Database db,
                           List<String> processorCapabilities,
                           String processorId)
                    throws MetaException

Parameters:

db - A database object to be transformed, mainly db location

processorCapabilities - A array of String capabilities received from the data processor

processorId - String ID used for logging purpose.

Returns:

Database An altered Database based on the processor capabilities

Throws:

MetaException

transformAlterTable

Table transformAlterTable(Table oldTable,
                          Table newTable,
                          List<String> processorCapabilities,
                          String processorId)
                   throws MetaException

Parameters:

oldTable - A table object to be transformed prior to the alteration of a table

processorCapabilities - A array of String capabilities received from the data processor

processorId - String ID used for logging purpose.

Returns:

Table An altered Table based on the processor capabilities

Throws:

MetaException