com.metamx.druid.merger.common.task.DeleteTask.java Source code

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Here is the source code for com.metamx.druid.merger.common.task.DeleteTask.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.merger.common.task;

import com.google.common.collect.Lists;
import com.metamx.common.logger.Logger;
import com.metamx.druid.QueryGranularity;
import com.metamx.druid.aggregation.AggregatorFactory;
import com.metamx.druid.client.DataSegment;
import com.metamx.druid.index.v1.IncrementalIndex;
import com.metamx.druid.index.v1.IncrementalIndexAdapter;
import com.metamx.druid.index.v1.IndexMerger;
import com.metamx.druid.index.v1.IndexableAdapter;
import com.metamx.druid.jackson.DefaultObjectMapper;
import com.metamx.druid.merger.common.TaskStatus;
import com.metamx.druid.merger.common.TaskToolbox;
import com.metamx.druid.merger.coordinator.TaskContext;
import com.metamx.druid.shard.NoneShardSpec;
import org.codehaus.jackson.annotate.JsonCreator;
import org.codehaus.jackson.annotate.JsonProperty;
import org.codehaus.jackson.map.ObjectMapper;
import org.joda.time.DateTime;
import org.joda.time.Interval;

import java.io.File;
import java.util.ArrayList;

public class DeleteTask extends AbstractTask {
    private static final Logger log = new Logger(DeleteTask.class);

    @JsonCreator
    public DeleteTask(@JsonProperty("dataSource") String dataSource, @JsonProperty("interval") Interval interval) {
        super(String.format("delete_%s_%s_%s_%s", dataSource, interval.getStart(), interval.getEnd(),
                new DateTime().toString()), dataSource, interval);
    }

    @Override
    public Type getType() {
        return Task.Type.DELETE;
    }

    @Override
    public TaskStatus run(TaskContext context, TaskToolbox toolbox) throws Exception {
        // Strategy: Create an empty segment covering the interval to be deleted
        final IncrementalIndex empty = new IncrementalIndex(0, QueryGranularity.NONE, new AggregatorFactory[0]);
        final IndexableAdapter emptyAdapter = new IncrementalIndexAdapter(this.getInterval(), empty);

        // Create DataSegment
        final DataSegment segment = DataSegment.builder().dataSource(this.getDataSource())
                .interval(this.getInterval()).version(context.getVersion()).shardSpec(new NoneShardSpec()).build();

        final File outDir = new File(toolbox.getConfig().getTaskDir(this), segment.getIdentifier());
        final File fileToUpload = IndexMerger.merge(Lists.newArrayList(emptyAdapter), new AggregatorFactory[0],
                outDir);

        // Upload the segment
        final DataSegment uploadedSegment = toolbox.getSegmentPusher().push(fileToUpload, segment);

        log.info("Uploaded tombstone segment for[%s] interval[%s] with version[%s]", segment.getDataSource(),
                segment.getInterval(), segment.getVersion());

        return TaskStatus.success(getId(), Lists.newArrayList(uploadedSegment));
    }
}