org.apache.hadoop.hbase.client

Interface AsyncTableRegionLocator

@InterfaceAudience.Public
public interface AsyncTableRegionLocator

The asynchronous version of RegionLocator.

Usually the implementations will not throw any exception directly, you need to get the exception from the returned CompletableFuture.

Since:

2.0.0

Method Summary

Modifier and Type	Method and Description
void	clearRegionLocationCache() Clear all the entries in the region location cache.
CompletableFuture<List<HRegionLocation>>	getAllRegionLocations() Retrieves all of the regions associated with this table.
default CompletableFuture<List<byte[]>>	getEndKeys() Gets the ending row key for every region in the currently open table.
TableName	getName() Gets the fully qualified table name instance of the table whose region we want to locate.
default CompletableFuture<HRegionLocation>	getRegionLocation(byte[] row) Finds the region on which the given row is being served.
default CompletableFuture<HRegionLocation>	getRegionLocation(byte[] row, boolean reload) Finds the region on which the given row is being served.
default CompletableFuture<HRegionLocation>	getRegionLocation(byte[] row, int replicaId) Finds the region with the given replicaId on which the given row is being served.
CompletableFuture<HRegionLocation>	getRegionLocation(byte[] row, int replicaId, boolean reload) Finds the region with the given replicaId on which the given row is being served.
default CompletableFuture<List<HRegionLocation>>	getRegionLocations(byte[] row) Find all the replicas for the region on which the given row is being served.
CompletableFuture<List<HRegionLocation>>	getRegionLocations(byte[] row, boolean reload) Find all the replicas for the region on which the given row is being served.
default CompletableFuture<List<Pair<byte[],byte[]>>>	getStartEndKeys() Gets the starting and ending row keys for every region in the currently open table.
default CompletableFuture<List<byte[]>>	getStartKeys() Gets the starting row key for every region in the currently open table.

Method Detail

getName

TableName getName()

Gets the fully qualified table name instance of the table whose region we want to locate.

getRegionLocation

default CompletableFuture<HRegionLocation> getRegionLocation(byte[] row)

Finds the region on which the given row is being served. Does not reload the cache.

Returns the location of the region to which the row belongs.

Parameters:

row - Row to find.

getRegionLocation

default CompletableFuture<HRegionLocation> getRegionLocation(byte[] row,
                                                             boolean reload)

Finds the region on which the given row is being served.

Returns the location of the region to which the row belongs.

Parameters:

row - Row to find.

reload - true to reload information or false to use cached information

getRegionLocation

default CompletableFuture<HRegionLocation> getRegionLocation(byte[] row,
                                                             int replicaId)

Finds the region with the given replicaId on which the given row is being served.

Returns the location of the region with the given replicaId to which the row belongs.

Parameters:

row - Row to find.

replicaId - the replica id of the region

getRegionLocation

CompletableFuture<HRegionLocation> getRegionLocation(byte[] row,
                                                     int replicaId,
                                                     boolean reload)

Finds the region with the given replicaId on which the given row is being served.

Returns the location of the region with the given replicaId to which the row belongs.

Parameters:

row - Row to find.

replicaId - the replica id of the region

reload - true to reload information or false to use cached information

getRegionLocations

default CompletableFuture<List<HRegionLocation>> getRegionLocations(byte[] row)

Find all the replicas for the region on which the given row is being served.

Parameters:

row - Row to find.

Returns:

Locations for all the replicas of the row.

Throws:

IOException - if a remote or network exception occurs

getRegionLocations

CompletableFuture<List<HRegionLocation>> getRegionLocations(byte[] row,
                                                            boolean reload)

Find all the replicas for the region on which the given row is being served.

Parameters:

row - Row to find.

reload - true to reload information or false to use cached information

Returns:

Locations for all the replicas of the row.

Throws:

IOException - if a remote or network exception occurs

getAllRegionLocations

CompletableFuture<List<HRegionLocation>> getAllRegionLocations()

Retrieves all of the regions associated with this table.

Usually we will go to meta table directly in this method so there is no reload parameter.

Notice that the location for region replicas other than the default replica are also returned.

Returns:

a List of all regions associated with this table.

getStartKeys

default CompletableFuture<List<byte[]>> getStartKeys()
                                              throws IOException

Gets the starting row key for every region in the currently open table.

This is mainly useful for the MapReduce integration.

Returns:

Array of region starting row keys

Throws:

IOException - if a remote or network exception occurs

getEndKeys

default CompletableFuture<List<byte[]>> getEndKeys()
                                            throws IOException

Gets the ending row key for every region in the currently open table.

This is mainly useful for the MapReduce integration.

Returns:

Array of region ending row keys

Throws:

IOException - if a remote or network exception occurs

getStartEndKeys

default CompletableFuture<List<Pair<byte[],byte[]>>> getStartEndKeys()
                                                              throws IOException

Gets the starting and ending row keys for every region in the currently open table.

This is mainly useful for the MapReduce integration.

Returns:

Pair of arrays of region starting and ending row keys

Throws:

IOException - if a remote or network exception occurs

clearRegionLocationCache

void clearRegionLocationCache()

Clear all the entries in the region location cache.

This may cause performance issue so use it with caution.