io.druid.indexing.common.task.DeleteTask.java Source code

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Here is the source code for io.druid.indexing.common.task.DeleteTask.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.indexing.common.task;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.metamx.common.logger.Logger;
import io.druid.granularity.QueryGranularity;
import io.druid.indexing.common.TaskLock;
import io.druid.indexing.common.TaskStatus;
import io.druid.indexing.common.TaskToolbox;
import io.druid.query.aggregation.AggregatorFactory;
import io.druid.segment.IndexMerger;
import io.druid.segment.IndexableAdapter;
import io.druid.segment.incremental.IncrementalIndex;
import io.druid.segment.incremental.IncrementalIndexAdapter;
import io.druid.timeline.DataSegment;
import io.druid.timeline.partition.NoneShardSpec;
import org.joda.time.DateTime;
import org.joda.time.Interval;

import java.io.File;

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

    @JsonCreator
    public DeleteTask(@JsonProperty("id") String id, @JsonProperty("dataSource") String dataSource,
            @JsonProperty("interval") Interval interval) {
        super(id != null ? id
                : String.format("delete_%s_%s_%s_%s", dataSource, interval.getStart(), interval.getEnd(),
                        new DateTime().toString()),
                dataSource, Preconditions.checkNotNull(interval, "interval"));
    }

    @Override
    public String getType() {
        return "delete";
    }

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

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

        final File outDir = new File(toolbox.getTaskWorkDir(), 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());

        toolbox.pushSegments(ImmutableList.of(uploadedSegment));

        return TaskStatus.success(getId());
    }
}