Apache9 commented on code in PR #5430: URL: https://github.com/apache/hbase/pull/5430#discussion_r1336743026
########## hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/CombinedWriter.java: ########## @@ -0,0 +1,94 @@ +/* + * 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.regionserver.wal; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.List; +import java.util.concurrent.Callable; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.Future; +import org.apache.hadoop.hbase.util.FutureUtils; +import org.apache.hadoop.hbase.wal.WAL.Entry; +import org.apache.hadoop.hbase.wal.WALProvider.Writer; +import org.apache.yetus.audience.InterfaceAudience; + +import org.apache.hbase.thirdparty.com.google.common.collect.ImmutableList; +import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder; + [email protected] +public final class CombinedWriter extends CombinedWriterBase<Writer> implements Writer { + + private final ImmutableList<ExecutorService> executors; + + private CombinedWriter(ImmutableList<Writer> writers) { + super(writers); + ImmutableList.Builder<ExecutorService> builder = + ImmutableList.builderWithExpectedSize(writers.size() - 1); + for (int i = 1; i < writers.size(); i++) { + Writer writer = writers.get(i); + builder.add(Executors.newSingleThreadExecutor(new ThreadFactoryBuilder() + .setNameFormat("Writer-" + writer + "-%d").setDaemon(true).build())); + } + this.executors = builder.build(); + } + + private interface Action { + void action(Writer writer) throws IOException; + } + + private void apply(Action action) throws IOException { Review Comment: We have already implemented the follow on solutions to allow concurrent wal syncs. You can see the code in SplitLogWorker.processSyncReplicationWAL. Anyway, let me update the code here and also add some comments around the order of writers. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
