org.apache.hadoop.hbase

Class ClientMetaTableAccessor

java.lang.Object

org.apache.hadoop.hbase.ClientMetaTableAccessor

@InterfaceAudience.Private
public final class ClientMetaTableAccessor
extends Object

The (asynchronous) meta table accessor used at client side. Used to read/write region and assignment information store in hbase:meta.

Since:

2.0.0

See Also:

CatalogFamilyFormat

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ClientMetaTableAccessor.CloseableVisitor Implementations 'visit' a catalog table row but with close() at the end.
static class	ClientMetaTableAccessor.QueryType
static interface	ClientMetaTableAccessor.Visitor Implementations 'visit' a catalog table row.

Method Summary

Modifier and Type	Method and Description
static CompletableFuture<Optional<HRegionLocation>>	getRegionLocation(AsyncTable<?> metaTable, byte[] regionName) Returns the HRegionLocation from meta for the given region
static CompletableFuture<Optional<HRegionLocation>>	getRegionLocationWithEncodedName(AsyncTable<?> metaTable, byte[] encodedRegionName) Returns the HRegionLocation from meta for the given encoded region name
static CompletableFuture<List<HRegionLocation>>	getTableHRegionLocations(AsyncTable<AdvancedScanResultConsumer> metaTable, TableName tableName) Used to get all region locations for the specific table.
static byte[]	getTableStartRowForMeta(TableName tableName, ClientMetaTableAccessor.QueryType type)
static CompletableFuture<Optional<TableState>>	getTableState(AsyncTable<?> metaTable, TableName tableName)
static byte[]	getTableStopRowForMeta(TableName tableName, ClientMetaTableAccessor.QueryType type)
static CompletableFuture<Boolean>	tableExists(AsyncTable<?> metaTable, TableName tableName)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

tableExists

public static CompletableFuture<Boolean> tableExists(AsyncTable<?> metaTable,
                                                     TableName tableName)

getTableState

public static CompletableFuture<Optional<TableState>> getTableState(AsyncTable<?> metaTable,
                                                                    TableName tableName)

getRegionLocation

public static CompletableFuture<Optional<HRegionLocation>> getRegionLocation(AsyncTable<?> metaTable,
                                                                             byte[] regionName)

Returns the HRegionLocation from meta for the given region

Parameters:

metaTable -

regionName - region we're looking for

Returns:

HRegionLocation for the given region

getRegionLocationWithEncodedName

public static CompletableFuture<Optional<HRegionLocation>> getRegionLocationWithEncodedName(AsyncTable<?> metaTable,
                                                                                            byte[] encodedRegionName)

Returns the HRegionLocation from meta for the given encoded region name

Parameters:

metaTable -

encodedRegionName - region we're looking for

Returns:

HRegionLocation for the given region

getTableHRegionLocations

public static CompletableFuture<List<HRegionLocation>> getTableHRegionLocations(AsyncTable<AdvancedScanResultConsumer> metaTable,
                                                                                TableName tableName)

Used to get all region locations for the specific table.

Parameters:

metaTable -

tableName - table we're looking for, can be null for getting all regions

Returns:

the list of region locations. The return value will be wrapped by a CompletableFuture.

getTableStartRowForMeta

public static byte[] getTableStartRowForMeta(TableName tableName,
                                             ClientMetaTableAccessor.QueryType type)

Parameters:

tableName - table we're working with

Returns:

start row for scanning META according to query type

getTableStopRowForMeta

public static byte[] getTableStopRowForMeta(TableName tableName,
                                            ClientMetaTableAccessor.QueryType type)

Parameters:

tableName - table we're working with

Returns:

stop row for scanning META according to query type