org.apache.hadoop.hbase.client

Class AsyncAdminClientUtils

java.lang.Object

org.apache.hadoop.hbase.client.AsyncAdminClientUtils

@InterfaceAudience.Public
public final class AsyncAdminClientUtils
extends Object

Additional Asynchronous Admin capabilities for clients.

Method Summary

Modifier and Type	Method and Description
static <S,R> CompletableFuture<Map<ServerName,Object>>	coprocessorServiceOnAllRegionServers(AsyncAdmin asyncAdmin, Function<com.google.protobuf.RpcChannel,S> stubMaker, ServiceCaller<S,R> callable) Execute the given coprocessor call on all region servers.

Methods inherited from class java.lang.Object

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

Method Detail

coprocessorServiceOnAllRegionServers

public static <S,R> CompletableFuture<Map<ServerName,Object>> coprocessorServiceOnAllRegionServers(AsyncAdmin asyncAdmin,
                                                                                                   Function<com.google.protobuf.RpcChannel,S> stubMaker,
                                                                                                   ServiceCaller<S,R> callable)

Execute the given coprocessor call on all region servers.

The stubMaker is just a delegation to the newStub call. Usually it is only a one line lambda expression, like:

 channel -> xxxService.newStub(channel)
 

Type Parameters:

S - the type of the asynchronous stub

R - the type of the return value

Parameters:

asyncAdmin - the asynchronous administrative API for HBase.

stubMaker - a delegation to the actual newStub call.

callable - a delegation to the actual protobuf rpc call. See the comment of ServiceCaller for more details.

Returns:

Map of each region server to its result of the protobuf rpc call, wrapped by a CompletableFuture.

See Also:

ServiceCaller