| /** |
| * 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.cassandra.service; |
| |
| import org.apache.cassandra.concurrent.JMXEnabledThreadPoolExecutor; |
| import org.apache.cassandra.concurrent.NamedThreadFactory; |
| import org.apache.cassandra.config.Schema; |
| import org.apache.cassandra.db.Keyspace; |
| import org.apache.cassandra.locator.AbstractReplicationStrategy; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.concurrent.*; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| public class PendingRangeCalculatorService |
| { |
| public static final PendingRangeCalculatorService instance = new PendingRangeCalculatorService(); |
| |
| private static Logger logger = LoggerFactory.getLogger(PendingRangeCalculatorService.class); |
| private final JMXEnabledThreadPoolExecutor executor = new JMXEnabledThreadPoolExecutor(1, Integer.MAX_VALUE, TimeUnit.SECONDS, |
| new LinkedBlockingQueue<Runnable>(1), new NamedThreadFactory("PendingRangeCalculator"), "internal"); |
| |
| private AtomicInteger updateJobs = new AtomicInteger(0); |
| |
| public PendingRangeCalculatorService() |
| { |
| executor.setRejectedExecutionHandler(new RejectedExecutionHandler() |
| { |
| public void rejectedExecution(Runnable r, ThreadPoolExecutor e) |
| { |
| PendingRangeCalculatorService.instance.finishUpdate(); |
| } |
| } |
| ); |
| } |
| |
| private static class PendingRangeTask implements Runnable |
| { |
| public void run() |
| { |
| long start = System.currentTimeMillis(); |
| for (String keyspaceName : Schema.instance.getNonSystemKeyspaces()) |
| { |
| calculatePendingRanges(Keyspace.open(keyspaceName).getReplicationStrategy(), keyspaceName); |
| } |
| PendingRangeCalculatorService.instance.finishUpdate(); |
| logger.debug("finished calculation for {} keyspaces in {}ms", Schema.instance.getNonSystemKeyspaces().size(), System.currentTimeMillis() - start); |
| } |
| } |
| |
| private void finishUpdate() |
| { |
| updateJobs.decrementAndGet(); |
| } |
| |
| public void update() |
| { |
| updateJobs.incrementAndGet(); |
| executor.submit(new PendingRangeTask()); |
| } |
| |
| public void blockUntilFinished() |
| { |
| // We want to be sure the job we're blocking for is actually finished and we can't trust the TPE's active job count |
| while (updateJobs.get() > 0) |
| { |
| try |
| { |
| Thread.sleep(100); |
| } |
| catch (InterruptedException e) |
| { |
| throw new RuntimeException(e); |
| } |
| } |
| } |
| |
| |
| // public & static for testing purposes |
| public static void calculatePendingRanges(AbstractReplicationStrategy strategy, String keyspaceName) |
| { |
| StorageService.instance.getTokenMetadata().calculatePendingRanges(strategy, keyspaceName); |
| } |
| } |