| /** |
| * 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.schema.Schema; |
| import org.apache.cassandra.db.Keyspace; |
| import org.apache.cassandra.locator.AbstractReplicationStrategy; |
| import org.apache.cassandra.utils.ExecutorUtils; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.List; |
| import java.util.concurrent.*; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| |
| public class PendingRangeCalculatorService |
| { |
| public static final PendingRangeCalculatorService instance = new PendingRangeCalculatorService(); |
| |
| private static Logger logger = LoggerFactory.getLogger(PendingRangeCalculatorService.class); |
| |
| // the executor will only run a single range calculation at a time while keeping at most one task queued in order |
| // to trigger an update only after the most recent state change and not for each update individually |
| private final JMXEnabledThreadPoolExecutor executor = new JMXEnabledThreadPoolExecutor(1, Integer.MAX_VALUE, TimeUnit.SECONDS, |
| new LinkedBlockingQueue<>(1), new NamedThreadFactory("PendingRangeCalculator"), "internal"); |
| |
| private AtomicInteger updateJobs = new AtomicInteger(0); |
| |
| public PendingRangeCalculatorService() |
| { |
| executor.setRejectedExecutionHandler((r, e) -> |
| { |
| PendingRangeCalculatorServiceDiagnostics.taskRejected(instance, updateJobs); |
| PendingRangeCalculatorService.instance.finishUpdate(); |
| } |
| ); |
| } |
| |
| private static class PendingRangeTask implements Runnable |
| { |
| private final AtomicInteger updateJobs; |
| |
| PendingRangeTask(AtomicInteger updateJobs) |
| { |
| this.updateJobs = updateJobs; |
| } |
| |
| public void run() |
| { |
| try |
| { |
| PendingRangeCalculatorServiceDiagnostics.taskStarted(instance, updateJobs); |
| long start = System.currentTimeMillis(); |
| List<String> keyspaces = Schema.instance.getNonLocalStrategyKeyspaces(); |
| for (String keyspaceName : keyspaces) |
| calculatePendingRanges(Keyspace.open(keyspaceName).getReplicationStrategy(), keyspaceName); |
| if (logger.isTraceEnabled()) |
| logger.trace("Finished PendingRangeTask for {} keyspaces in {}ms", keyspaces.size(), System.currentTimeMillis() - start); |
| PendingRangeCalculatorServiceDiagnostics.taskFinished(instance, updateJobs); |
| } |
| finally |
| { |
| PendingRangeCalculatorService.instance.finishUpdate(); |
| } |
| } |
| } |
| |
| private void finishUpdate() |
| { |
| int jobs = updateJobs.decrementAndGet(); |
| PendingRangeCalculatorServiceDiagnostics.taskCountChanged(instance, jobs); |
| } |
| |
| public void update() |
| { |
| int jobs = updateJobs.incrementAndGet(); |
| PendingRangeCalculatorServiceDiagnostics.taskCountChanged(instance, jobs); |
| executor.execute(new PendingRangeTask(updateJobs)); |
| } |
| |
| 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); |
| } |
| |
| @VisibleForTesting |
| public void shutdownAndWait(long timeout, TimeUnit unit) throws InterruptedException, TimeoutException |
| { |
| ExecutorUtils.shutdownNowAndWait(timeout, unit, executor); |
| } |
| } |