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org.apache.cassandra.db.compaction.CompactionManager Maven / Gradle / Ivy

/*
 * 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.db.compaction;

import java.io.File;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Predicate;
import javax.management.openmbean.OpenDataException;
import javax.management.openmbean.TabularData;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.*;
import com.google.common.util.concurrent.*;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.cassandra.cache.AutoSavingCache;
import org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor;
import org.apache.cassandra.concurrent.JMXEnabledThreadPoolExecutor;
import org.apache.cassandra.concurrent.NamedThreadFactory;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.compaction.CompactionInfo.Holder;
import org.apache.cassandra.db.lifecycle.ILifecycleTransaction;
import org.apache.cassandra.db.lifecycle.LifecycleTransaction;
import org.apache.cassandra.db.lifecycle.SSTableSet;
import org.apache.cassandra.db.lifecycle.View;
import org.apache.cassandra.db.lifecycle.WrappedLifecycleTransaction;
import org.apache.cassandra.db.rows.UnfilteredRowIterator;
import org.apache.cassandra.db.view.ViewBuilder;
import org.apache.cassandra.dht.Bounds;
import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.index.SecondaryIndexBuilder;
import org.apache.cassandra.io.sstable.Descriptor;
import org.apache.cassandra.io.sstable.ISSTableScanner;
import org.apache.cassandra.io.sstable.IndexSummaryRedistribution;
import org.apache.cassandra.io.sstable.SSTableRewriter;
import org.apache.cassandra.io.sstable.SnapshotDeletingTask;
import org.apache.cassandra.io.sstable.format.SSTableReader;
import org.apache.cassandra.io.sstable.format.SSTableWriter;
import org.apache.cassandra.io.sstable.metadata.MetadataCollector;
import org.apache.cassandra.io.util.FileUtils;
import org.apache.cassandra.metrics.CompactionMetrics;
import org.apache.cassandra.repair.Validator;
import org.apache.cassandra.service.ActiveRepairService;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.*;
import org.apache.cassandra.utils.concurrent.Refs;

import static java.util.Collections.singleton;

/**
 * 

 * A singleton which manages a private executor of ongoing compactions.
 * 
 * Scheduling for compaction is accomplished by swapping sstables to be compacted into
 * a set via Tracker. New scheduling attempts will ignore currently compacting
 * sstables.
 */
public class CompactionManager implements CompactionManagerMBean
{
    public static final String MBEAN_OBJECT_NAME = "org.apache.cassandra.db:type=CompactionManager";
    private static final Logger logger = LoggerFactory.getLogger(CompactionManager.class);
    public static final CompactionManager instance;

    public static final int NO_GC = Integer.MIN_VALUE;
    public static final int GC_ALL = Integer.MAX_VALUE;

    // A thread local that tells us if the current thread is owned by the compaction manager. Used
    // by CounterContext to figure out if it should log a warning for invalid counter shards.
    public static final ThreadLocal isCompactionManager = new ThreadLocal()
    {
        @Override
        protected Boolean initialValue()
        {
            return false;
        }
    };

    static
    {
        instance = new CompactionManager();

        MBeanWrapper.instance.registerMBean(instance, MBEAN_OBJECT_NAME);
    }

    private final CompactionExecutor executor = new CompactionExecutor();
    private final CompactionExecutor validationExecutor = new ValidationExecutor();
    private final CompactionExecutor cacheCleanupExecutor = new CacheCleanupExecutor();

    private final CompactionMetrics metrics = new CompactionMetrics(executor, validationExecutor);
    @VisibleForTesting
    final Multiset compactingCF = ConcurrentHashMultiset.create();

    // used to temporarily pause non-strategy managed compactions (like index summary redistribution)
    private final AtomicInteger globalCompactionPauseCount = new AtomicInteger(0);

    private final RateLimiter compactionRateLimiter = RateLimiter.create(Double.MAX_VALUE);

    /**
     * Gets compaction rate limiter.
     * Rate unit is bytes per sec.
     *
     * @return RateLimiter with rate limit set
     */
    public RateLimiter getRateLimiter()
    {
        setRate(DatabaseDescriptor.getCompactionThroughputMbPerSec());
        return compactionRateLimiter;
    }

    /**
     * Sets the rate for the rate limiter. When compaction_throughput_mb_per_sec is 0 or node is bootstrapping,
     * this sets the rate to Double.MAX_VALUE bytes per second.
     * @param throughPutMbPerSec throughput to set in mb per second
     */
    public void setRate(final double throughPutMbPerSec)
    {
        double throughput = throughPutMbPerSec * 1024.0 * 1024.0;
        // if throughput is set to 0, throttling is disabled
        if (throughput == 0 || StorageService.instance.isBootstrapMode())
            throughput = Double.MAX_VALUE;
        if (compactionRateLimiter.getRate() != throughput)
            compactionRateLimiter.setRate(throughput);
    }

    /**
     * Call this whenever a compaction might be needed on the given columnfamily.
     * It's okay to over-call (within reason) if a call is unnecessary, it will
     * turn into a no-op in the bucketing/candidate-scan phase.
     */
    public List> submitBackground(final ColumnFamilyStore cfs)
    {
        if (cfs.isAutoCompactionDisabled())
        {
            logger.trace("Autocompaction is disabled");
            return Collections.emptyList();
        }

        /**
         * If a CF is currently being compacted, and there are no idle threads, submitBackground should be a no-op;
         * we can wait for the current compaction to finish and re-submit when more information is available.
         * Otherwise, we should submit at least one task to prevent starvation by busier CFs, and more if there
         * are idle threads stil. (CASSANDRA-4310)
         */
        int count = compactingCF.count(cfs);
        if (count > 0 && executor.getActiveCount() >= executor.getMaximumPoolSize())
        {
            logger.trace("Background compaction is still running for {}.{} ({} remaining). Skipping",
                         cfs.keyspace.getName(), cfs.name, count);
            return Collections.emptyList();
        }

        logger.trace("Scheduling a background task check for {}.{} with {}",
                     cfs.keyspace.getName(),
                     cfs.name,
                     cfs.getCompactionStrategyManager().getName());

        List> futures = new ArrayList<>(1);
        Future fut = executor.submitIfRunning(new BackgroundCompactionCandidate(cfs), "background task");
        if (!fut.isCancelled())
            futures.add(fut);
        else
            compactingCF.remove(cfs);
        return futures;
    }

    public boolean isCompacting(Iterable cfses)
    {
        for (ColumnFamilyStore cfs : cfses)
            if (!cfs.getTracker().getCompacting().isEmpty())
                return true;
        return false;
    }

    /**
     * Shutdowns both compaction and validation executors, cancels running compaction / validation,
     * and waits for tasks to complete if tasks were not cancelable.
     */
    public void forceShutdown()
    {
        // shutdown executors to prevent further submission
        executor.shutdown();
        validationExecutor.shutdown();
        cacheCleanupExecutor.shutdown();

        // interrupt compactions and validations
        for (Holder compactionHolder : CompactionMetrics.getCompactions())
        {
            compactionHolder.stop();
        }

        // wait for tasks to terminate
        // compaction tasks are interrupted above, so it shuold be fairy quick
        // until not interrupted tasks to complete.
        for (ExecutorService exec : Arrays.asList(executor, validationExecutor, cacheCleanupExecutor))
        {
            try
            {
                if (!exec.awaitTermination(1, TimeUnit.MINUTES))
                    logger.warn("Failed to wait for compaction executors shutdown");
            }
            catch (InterruptedException e)
            {
                logger.error("Interrupted while waiting for tasks to be terminated", e);
            }
        }
    }

    public void finishCompactionsAndShutdown(long timeout, TimeUnit unit) throws InterruptedException
    {
        executor.shutdown();
        executor.awaitTermination(timeout, unit);
    }

    // the actual sstables to compact are not determined until we run the BCT; that way, if new sstables
    // are created between task submission and execution, we execute against the most up-to-date information
    class BackgroundCompactionCandidate implements Runnable
    {
        private final ColumnFamilyStore cfs;

        BackgroundCompactionCandidate(ColumnFamilyStore cfs)
        {
            compactingCF.add(cfs);
            this.cfs = cfs;
        }

        public void run()
        {
            try
            {
                logger.trace("Checking {}.{}", cfs.keyspace.getName(), cfs.name);
                if (!cfs.isValid())
                {
                    logger.trace("Aborting compaction for dropped CF");
                    return;
                }

                CompactionStrategyManager strategy = cfs.getCompactionStrategyManager();
                AbstractCompactionTask task = strategy.getNextBackgroundTask(getDefaultGcBefore(cfs, FBUtilities.nowInSeconds()));
                if (task == null)
                {
                    logger.trace("No tasks available");
                    return;
                }
                task.execute(metrics);
            }
            finally
            {
                compactingCF.remove(cfs);
            }
            submitBackground(cfs);
        }
    }

    /**
     * Run an operation over all sstables using jobs threads
     *
     * @param cfs the column family store to run the operation on
     * @param operation the operation to run
     * @param jobs the number of threads to use - 0 means use all available. It never uses more than concurrent_compactors threads
     * @return status of the operation
     * @throws ExecutionException
     * @throws InterruptedException
     */
    @SuppressWarnings("resource")
    private AllSSTableOpStatus parallelAllSSTableOperation(final ColumnFamilyStore cfs, final OneSSTableOperation operation, int jobs, OperationType operationType) throws ExecutionException, InterruptedException
    {
        logger.info("Starting {} for {}.{}", operationType, cfs.keyspace.getName(), cfs.getTableName());
        List transactions = new ArrayList<>();
        List> futures = new ArrayList<>();
        try (LifecycleTransaction compacting = cfs.markAllCompacting(operationType))
        {
            if (compacting == null)
                return AllSSTableOpStatus.UNABLE_TO_CANCEL;

            Iterable sstables = Lists.newArrayList(operation.filterSSTables(compacting));
            if (Iterables.isEmpty(sstables))
            {
                logger.info("No sstables for {}.{}", cfs.keyspace.getName(), cfs.name);
                return AllSSTableOpStatus.SUCCESSFUL;
            }

            for (final SSTableReader sstable : sstables)
            {
                final LifecycleTransaction txn = compacting.split(singleton(sstable));
                transactions.add(txn);
                Callable