io.druid.segment.loading.HdfsDataSegmentPusher.java Source code

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Here is the source code for io.druid.segment.loading.HdfsDataSegmentPusher.java

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/*
 * Druid - a distributed column store.
 * Copyright (C) 2012, 2013  Metamarkets Group Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package io.druid.segment.loading;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.collect.ImmutableMap;
import com.google.common.io.ByteStreams;
import com.google.common.io.Closeables;
import com.google.common.io.OutputSupplier;
import com.google.inject.Inject;
import com.metamx.common.logger.Logger;
import io.druid.common.utils.CompressionUtils;
import io.druid.segment.IndexIO;
import io.druid.timeline.DataSegment;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;

/**
 */
public class HdfsDataSegmentPusher implements DataSegmentPusher {
    private static final Logger log = new Logger(HdfsDataSegmentPusher.class);

    private final HdfsDataSegmentPusherConfig config;
    private final Configuration hadoopConfig;
    private final ObjectMapper jsonMapper;

    @Inject
    public HdfsDataSegmentPusher(HdfsDataSegmentPusherConfig config, Configuration hadoopConfig,
            ObjectMapper jsonMapper) {
        this.config = config;
        this.hadoopConfig = hadoopConfig;
        this.jsonMapper = jsonMapper;
    }

    @Override
    public DataSegment push(File inDir, DataSegment segment) throws IOException {
        final String storageDir = DataSegmentPusherUtil.getHdfsStorageDir(segment);
        Path outFile = new Path(String.format("%s/%s/index.zip", config.getStorageDirectory(), storageDir));
        FileSystem fs = outFile.getFileSystem(hadoopConfig);

        fs.mkdirs(outFile.getParent());
        log.info("Compressing files from[%s] to [%s]", inDir, outFile);
        FSDataOutputStream out = null;
        long size;
        try {
            out = fs.create(outFile);

            size = CompressionUtils.zip(inDir, out);

            out.close();
        } finally {
            Closeables.closeQuietly(out);
        }

        return createDescriptorFile(segment.withLoadSpec(makeLoadSpec(outFile)).withSize(size)
                .withBinaryVersion(IndexIO.CURRENT_VERSION_ID), outFile.getParent(), fs);
    }

    private DataSegment createDescriptorFile(DataSegment segment, Path outDir, final FileSystem fs)
            throws IOException {
        final Path descriptorFile = new Path(outDir, "descriptor.json");
        log.info("Creating descriptor file at[%s]", descriptorFile);
        ByteStreams.copy(ByteStreams.newInputStreamSupplier(jsonMapper.writeValueAsBytes(segment)),
                new HdfsOutputStreamSupplier(fs, descriptorFile));
        return segment;
    }

    private ImmutableMap<String, Object> makeLoadSpec(Path outFile) {
        return ImmutableMap.<String, Object>of("type", "hdfs", "path", outFile.toString());
    }

    private static class HdfsOutputStreamSupplier implements OutputSupplier<OutputStream> {
        private final FileSystem fs;
        private final Path descriptorFile;

        public HdfsOutputStreamSupplier(FileSystem fs, Path descriptorFile) {
            this.fs = fs;
            this.descriptorFile = descriptorFile;
        }

        @Override
        public OutputStream getOutput() throws IOException {
            return fs.create(descriptorFile);
        }
    }
}