org.apache.druid.indexing.common.task.RestoreTask.java Source code

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

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.druid.indexing.common.task;

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

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

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(getOrMakeId(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.getTaskActionClient()));

        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());
        }

        final List<DataSegment> restoredSegments = new ArrayList<>();

        // Move segments
        for (DataSegment segment : unusedSegments) {
            final DataSegment restored = toolbox.getDataSegmentArchiver().restore(segment);
            if (restored != null) {
                restoredSegments.add(restored);
            } else {
                log.info("Segment [%s] did not move, not updating metadata", segment);
            }
        }

        if (restoredSegments.isEmpty()) {
            log.info("No segments restored");
        } else {
            // Update metadata for moved segments
            toolbox.getTaskActionClient()
                    .submit(new SegmentMetadataUpdateAction(ImmutableSet.copyOf(restoredSegments)));
        }

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