org.apache.hadoop.hbase.client.AsyncAdminClientUtils Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.client;
import com.google.protobuf.RpcChannel;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.util.FutureUtils;
import org.apache.yetus.audience.InterfaceAudience;
/**
* Additional Asynchronous Admin capabilities for clients.
*/
@InterfaceAudience.Public
public final class AsyncAdminClientUtils {
private AsyncAdminClientUtils() {
}
/**
* Execute the given coprocessor call on all region servers.
*
* The {@code stubMaker} is just a delegation to the {@code newStub} call. Usually it is only a
* one line lambda expression, like:
*
*
* channel -> xxxService.newStub(channel)
*
*
* @param asyncAdmin the asynchronous administrative API for HBase.
* @param stubMaker a delegation to the actual {@code newStub} call.
* @param callable a delegation to the actual protobuf rpc call. See the comment of
* {@link ServiceCaller} for more details.
* @param the type of the asynchronous stub
* @param the type of the return value
* @return Map of each region server to its result of the protobuf rpc call, wrapped by a
* {@link CompletableFuture}.
* @see ServiceCaller
*/
public static CompletableFuture>
coprocessorServiceOnAllRegionServers(AsyncAdmin asyncAdmin, Function stubMaker,
ServiceCaller callable) {
CompletableFuture> future = new CompletableFuture<>();
FutureUtils.addListener(asyncAdmin.getRegionServers(), (regionServers, error) -> {
if (error != null) {
future.completeExceptionally(error);
return;
}
Map resultMap = new ConcurrentHashMap<>();
for (ServerName regionServer : regionServers) {
FutureUtils.addListener(asyncAdmin.coprocessorService(stubMaker, callable, regionServer),
(server, err) -> {
if (err != null) {
resultMap.put(regionServer, err);
} else {
resultMap.put(regionServer, server);
}
if (resultMap.size() == regionServers.size()) {
future.complete(Collections.unmodifiableMap(resultMap));
}
});
}
});
return future;
}
}