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

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Here is the source code for com.metamx.druid.merger.common.task.KillTask.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.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.metamx.common.ISE;
import com.metamx.common.logger.Logger;
import com.metamx.druid.client.DataSegment;
import com.metamx.druid.merger.common.TaskLock;
import com.metamx.druid.merger.common.TaskStatus;
import com.metamx.druid.merger.common.TaskToolbox;
import com.metamx.druid.merger.common.actions.LockListAction;
import com.metamx.druid.merger.common.actions.SegmentListUnusedAction;
import com.metamx.druid.merger.common.actions.SegmentNukeAction;
import org.joda.time.DateTime;
import org.joda.time.Interval;

import java.util.List;

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

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

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

    @Override
    public TaskStatus run(TaskToolbox toolbox) throws Exception {
        // Confirm we have a lock (will throw if there isn't exactly one element)
        final TaskLock myLock = Iterables
                .getOnlyElement(toolbox.getTaskActionClient().submit(new LockListAction()));

        if (!myLock.getDataSource().equals(getDataSource())) {
            throw new ISE("WTF?! Lock dataSource[%s] != task dataSource[%s]", myLock.getDataSource(),
                    getDataSource());
        }

        if (!myLock.getInterval().equals(getImplicitLockInterval().get())) {
            throw new ISE("WTF?! Lock interval[%s] != task interval[%s]", myLock.getInterval(),
                    getImplicitLockInterval().get());
        }

        // List unused segments
        final List<DataSegment> unusedSegments = toolbox.getTaskActionClient()
                .submit(new SegmentListUnusedAction(myLock.getDataSource(), myLock.getInterval()));

        // Verify none of these segments have versions > lock version
        for (final DataSegment unusedSegment : unusedSegments) {
            if (unusedSegment.getVersion().compareTo(myLock.getVersion()) > 0) {
                throw new ISE("WTF?! Unused segment[%s] has version[%s] > task version[%s]",
                        unusedSegment.getIdentifier(), unusedSegment.getVersion(), myLock.getVersion());
            }

            log.info("OK to kill segment: %s", unusedSegment.getIdentifier());
        }

        // Kill segments
        for (DataSegment segment : unusedSegments) {
            toolbox.getDataSegmentKiller().kill(segment);
        }

        // Remove metadata for these segments
        toolbox.getTaskActionClient().submit(new SegmentNukeAction(ImmutableSet.copyOf(unusedSegments)));

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