org.apache.hadoop.hbase.regionserver.DefaultStoreFileManager.java Source code

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Here is the source code for org.apache.hadoop.hbase.regionserver.DefaultStoreFileManager.java

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/**
 *
 * 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;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.KeyValue.KVComparator;

import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;

/**
 * Default implementation of StoreFileManager. Not thread-safe.
 */
@InterfaceAudience.Private
class DefaultStoreFileManager implements StoreFileManager {
    static final Log LOG = LogFactory.getLog(DefaultStoreFileManager.class);

    private final KVComparator kvComparator;
    private final Configuration conf;

    /**
     * List of store files inside this store. This is an immutable list that
     * is atomically replaced when its contents change.
     */
    private volatile ImmutableList<StoreFile> storefiles = null;

    public DefaultStoreFileManager(KVComparator kvComparator, Configuration conf) {
        this.kvComparator = kvComparator;
        this.conf = conf;
    }

    @Override
    public void loadFiles(List<StoreFile> storeFiles) {
        sortAndSetStoreFiles(storeFiles);
    }

    @Override
    public final Collection<StoreFile> getStorefiles() {
        return storefiles;
    }

    @Override
    public void insertNewFiles(Collection<StoreFile> sfs) throws IOException {
        ArrayList<StoreFile> newFiles = new ArrayList<StoreFile>(storefiles);
        newFiles.addAll(sfs);
        sortAndSetStoreFiles(newFiles);
    }

    @Override
    public ImmutableCollection<StoreFile> clearFiles() {
        ImmutableList<StoreFile> result = storefiles;
        storefiles = ImmutableList.of();
        return result;
    }

    @Override
    public final int getStorefileCount() {
        return storefiles.size();
    }

    @Override
    public void addCompactionResults(Collection<StoreFile> compactedFiles, Collection<StoreFile> results) {
        ArrayList<StoreFile> newStoreFiles = Lists.newArrayList(storefiles);
        newStoreFiles.removeAll(compactedFiles);
        if (!results.isEmpty()) {
            newStoreFiles.addAll(results);
        }
        sortAndSetStoreFiles(newStoreFiles);
    }

    @Override
    public final Iterator<StoreFile> getCandidateFilesForRowKeyBefore(final KeyValue targetKey) {
        return new ArrayList<StoreFile>(Lists.reverse(this.storefiles)).iterator();
    }

    @Override
    public Iterator<StoreFile> updateCandidateFilesForRowKeyBefore(Iterator<StoreFile> candidateFiles,
            final KeyValue targetKey, final KeyValue candidate) {
        // Default store has nothing useful to do here.
        // TODO: move this comment when implementing Level:
        // Level store can trim the list by range, removing all the files which cannot have
        // any useful candidates less than "candidate".
        return candidateFiles;
    }

    @Override
    public final byte[] getSplitPoint() throws IOException {
        if (this.storefiles.isEmpty()) {
            return null;
        }
        return StoreUtils.getLargestFile(this.storefiles).getFileSplitPoint(this.kvComparator);
    }

    @Override
    public final Collection<StoreFile> getFilesForScanOrGet(boolean isGet, byte[] startRow, byte[] stopRow) {
        // We cannot provide any useful input and already have the files sorted by seqNum.
        return getStorefiles();
    }

    @Override
    public int getStoreCompactionPriority() {
        int blockingFileCount = conf.getInt(HStore.BLOCKING_STOREFILES_KEY,
                HStore.DEFAULT_BLOCKING_STOREFILE_COUNT);
        int priority = blockingFileCount - storefiles.size();
        return (priority == HStore.PRIORITY_USER) ? priority + 1 : priority;
    }

    @Override
    public Collection<StoreFile> getUnneededFiles(long maxTs, List<StoreFile> filesCompacting) {
        Collection<StoreFile> expiredStoreFiles = null;
        ImmutableList<StoreFile> files = storefiles;
        // 1) We can never get rid of the last file which has the maximum seqid.
        // 2) Files that are not the latest can't become one due to (1), so the rest are fair game.
        for (int i = 0; i < files.size() - 1; ++i) {
            StoreFile sf = files.get(i);
            long fileTs = sf.getReader().getMaxTimestamp();
            if (fileTs < maxTs && !filesCompacting.contains(sf)) {
                LOG.info("Found an expired store file: " + sf.getPath() + " whose maxTimeStamp is " + fileTs
                        + ", which is below " + maxTs);
                if (expiredStoreFiles == null) {
                    expiredStoreFiles = new ArrayList<StoreFile>();
                }
                expiredStoreFiles.add(sf);
            }
        }
        return expiredStoreFiles;
    }

    private void sortAndSetStoreFiles(List<StoreFile> storeFiles) {
        Collections.sort(storeFiles, StoreFile.Comparators.SEQ_ID);
        storefiles = ImmutableList.copyOf(storeFiles);
    }

}