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

Introduction

Here is the source code for com.metamx.druid.indexing.common.task.DeleteTask.java

Source

/*
 * 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.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.ImmutableSet;
import com.google.common.collect.Iterables;
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.indexing.common.TaskLock;
import com.metamx.druid.indexing.common.TaskStatus;
import com.metamx.druid.indexing.common.TaskToolbox;
import com.metamx.druid.indexing.common.actions.LockListAction;
import com.metamx.druid.indexing.common.actions.SegmentInsertAction;
import com.metamx.druid.shard.NoneShardSpec;
import org.joda.time.DateTime;
import org.joda.time.Interval;

import java.io.File;

public class DeleteTask extends AbstractTask {
    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(toolbox.getTaskActionClient().submit(new LockListAction()));
        final Interval interval = this.getImplicitLockInterval().get();
        final IncrementalIndex empty = new IncrementalIndex(0, QueryGranularity.NONE, new AggregatorFactory[0]);
        final IndexableAdapter emptyAdapter = new IncrementalIndexAdapter(interval, empty);

        // Create DataSegment
        final DataSegment segment = DataSegment.builder().dataSource(this.getDataSource()).interval(interval)
                .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.getTaskActionClient().submit(new SegmentInsertAction(ImmutableSet.of(uploadedSegment)));

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