com.metamx.druid.indexer.DbUpdaterJob.java Source code

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Here is the source code for com.metamx.druid.indexer.DbUpdaterJob.java

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/*
 * Druid - a distributed column store.
 * Copyright (C) 2012  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 com.metamx.druid.indexer;

import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import com.metamx.common.logger.Logger;
import com.metamx.druid.client.DataSegment;
import com.metamx.druid.db.DbConnector;
import com.metamx.druid.indexer.updater.DbUpdaterJobSpec;
import com.metamx.druid.jackson.DefaultObjectMapper;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.codehaus.jackson.map.ObjectMapper;
import org.joda.time.DateTime;
import org.skife.jdbi.v2.DBI;
import org.skife.jdbi.v2.Handle;
import org.skife.jdbi.v2.tweak.HandleCallback;

import java.io.IOException;
import java.util.List;

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

    private static final ObjectMapper jsonMapper = new DefaultObjectMapper();

    private final HadoopDruidIndexerConfig config;
    private final DbUpdaterJobSpec spec;
    private final DBI dbi;

    // Keep track of published segment identifiers, in case a client is interested.
    private volatile ImmutableList<DataSegment> publishedSegments = null;

    public DbUpdaterJob(HadoopDruidIndexerConfig config) {
        this.config = config;
        this.spec = (DbUpdaterJobSpec) config.getUpdaterJobSpec();
        this.dbi = new DbConnector(spec).getDBI();
    }

    @Override
    public boolean run() {
        final Configuration conf = new Configuration();

        ImmutableList.Builder<DataSegment> publishedSegmentsBuilder = ImmutableList.builder();

        for (String propName : System.getProperties().stringPropertyNames()) {
            if (propName.startsWith("hadoop.")) {
                conf.set(propName.substring("hadoop.".length()), System.getProperty(propName));
            }
        }

        final Path descriptorInfoDir = config.makeDescriptorInfoDir();

        try {
            FileSystem fs = descriptorInfoDir.getFileSystem(conf);

            for (FileStatus status : fs.listStatus(descriptorInfoDir)) {
                final DataSegment segment = jsonMapper.readValue(fs.open(status.getPath()), DataSegment.class);

                dbi.withHandle(new HandleCallback<Void>() {
                    @Override
                    public Void withHandle(Handle handle) throws Exception {
                        handle.createStatement(String.format(
                                "INSERT INTO %s (id, dataSource, created_date, start, end, partitioned, version, used, payload) "
                                        + "VALUES (:id, :dataSource, :created_date, :start, :end, :partitioned, :version, :used, :payload)",
                                spec.getSegmentTable())).bind("id", segment.getIdentifier())
                                .bind("dataSource", segment.getDataSource())
                                .bind("created_date", new DateTime().toString())
                                .bind("start", segment.getInterval().getStart().toString())
                                .bind("end", segment.getInterval().getEnd().toString())
                                .bind("partitioned", segment.getShardSpec().getPartitionNum())
                                .bind("version", segment.getVersion()).bind("used", true)
                                .bind("payload", jsonMapper.writeValueAsString(segment)).execute();

                        return null;
                    }
                });

                publishedSegmentsBuilder.add(segment);
                log.info("Published %s", segment.getIdentifier());
            }
        } catch (IOException e) {
            throw Throwables.propagate(e);
        }

        publishedSegments = publishedSegmentsBuilder.build();

        return true;
    }

    /**
     * Returns a list of segment identifiers published by the most recent call to run().
     * Throws an IllegalStateException if run() has never been called.
     */
    public List<DataSegment> getPublishedSegments() {
        if (publishedSegments == null) {
            log.error("getPublishedSegments called before run!");
            throw new IllegalStateException("DbUpdaterJob has not run yet");
        } else {
            return publishedSegments;
        }
    }
}