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

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Here is the source code for io.druid.indexing.common.task.RestoreTask.java

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/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.druid.indexing.common.task;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.metamx.common.ISE;
import com.metamx.common.logger.Logger;
import io.druid.indexing.common.TaskLock;
import io.druid.indexing.common.TaskStatus;
import io.druid.indexing.common.TaskToolbox;
import io.druid.indexing.common.actions.SegmentListUnusedAction;
import io.druid.indexing.common.actions.SegmentMetadataUpdateAction;
import io.druid.timeline.DataSegment;
import java.util.Map;
import org.joda.time.Interval;

import java.util.List;

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

    public RestoreTask(@JsonProperty("id") String id, @JsonProperty("dataSource") String dataSource,
            @JsonProperty("interval") Interval interval, @JsonProperty("context") Map<String, Object> context) {
        super(makeId(id, "restore", dataSource, interval), dataSource, interval, context);
    }

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

    @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(getTaskLocks(toolbox));

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

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

        // 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 restore segment: %s", unusedSegment.getIdentifier());
        }

        List<DataSegment> restoredSegments = Lists.newLinkedList();

        // Move segments
        for (DataSegment segment : unusedSegments) {
            restoredSegments.add(toolbox.getDataSegmentArchiver().restore(segment));
        }

        // Update metadata for moved segments
        toolbox.getTaskActionClient()
                .submit(new SegmentMetadataUpdateAction(ImmutableSet.copyOf(restoredSegments)));

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