| /** |
| * 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 java.util.Collection; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.concurrent.SequentialExecutorPlus; |
| import org.apache.cassandra.concurrent.SequentialExecutorPlus.AtLeastOnceTrigger; |
| import org.apache.cassandra.db.Keyspace; |
| import org.apache.cassandra.locator.AbstractReplicationStrategy; |
| import org.apache.cassandra.schema.Schema; |
| import org.apache.cassandra.utils.ExecutorUtils; |
| |
| import static org.apache.cassandra.concurrent.ExecutorFactory.Global.executorFactory; |
| import static org.apache.cassandra.utils.Clock.Global.currentTimeMillis; |
| |
| public class PendingRangeCalculatorService |
| { |
| public static final PendingRangeCalculatorService instance = new PendingRangeCalculatorService(); |
| |
| private static final 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 SequentialExecutorPlus executor = executorFactory() |
| .withJmxInternal() |
| .configureSequential("PendingRangeCalculator") |
| .withRejectedExecutionHandler((r, e) -> {}) // silently handle rejected tasks, this::update takes care of bookkeeping |
| .build(); |
| |
| private final AtLeastOnceTrigger update = executor.atLeastOnceTrigger(() -> { |
| PendingRangeCalculatorServiceDiagnostics.taskStarted(1); |
| long start = currentTimeMillis(); |
| Collection<String> keyspaces = Schema.instance.getNonLocalStrategyKeyspaces().names(); |
| for (String keyspaceName : keyspaces) |
| calculatePendingRanges(Keyspace.open(keyspaceName).getReplicationStrategy(), keyspaceName); |
| if (logger.isTraceEnabled()) |
| logger.trace("Finished PendingRangeTask for {} keyspaces in {}ms", keyspaces.size(), currentTimeMillis() - start); |
| PendingRangeCalculatorServiceDiagnostics.taskFinished(); |
| }); |
| |
| public PendingRangeCalculatorService() |
| { |
| } |
| |
| public void update() |
| { |
| boolean success = update.trigger(); |
| if (!success) PendingRangeCalculatorServiceDiagnostics.taskRejected(1); |
| else PendingRangeCalculatorServiceDiagnostics.taskCountChanged(1); |
| } |
| |
| public void blockUntilFinished() |
| { |
| update.sync(); |
| } |
| |
| |
| public void executeWhenFinished(Runnable runnable) |
| { |
| update.runAfter(runnable); |
| } |
| |
| // 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); |
| } |
| |
| } |