ClientMetaTableAccessor (Apache HBase - Client 3.0.0-alpha-3 API)

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

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static CompletableFuture<Optional<HRegionLocation>>`	`getRegionLocation(AsyncTable<?> metaTable, byte[] regionName)` Returns the HRegionLocation from meta for the given region n * @param regionName region we're looking for
`static CompletableFuture<Optional<HRegionLocation>>`	`getRegionLocationWithEncodedName(AsyncTable<?> metaTable, byte[] encodedRegionName)` Returns the HRegionLocation from meta for the given encoded region name n * @param encodedRegionName region we're looking for
`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 n * @param 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 n * @param 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. n * @param 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

Class ClientMetaTableAccessor