io.druid.indexing.common.task.AppendTask Maven / Gradle / Ivy

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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.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Ordering;
import io.druid.segment.IndexIO;
import io.druid.segment.IndexMerger;
import io.druid.segment.IndexSpec;
import io.druid.segment.IndexableAdapter;
import io.druid.segment.QueryableIndexIndexableAdapter;
import io.druid.segment.Rowboat;
import io.druid.segment.RowboatFilteringIndexAdapter;
import io.druid.timeline.DataSegment;
import io.druid.timeline.TimelineObjectHolder;
import io.druid.timeline.VersionedIntervalTimeline;
import io.druid.timeline.partition.PartitionChunk;
import org.joda.time.Interval;

import javax.annotation.Nullable;
import java.io.File;
import java.util.List;
import java.util.Map;

/**
 */
public class AppendTask extends MergeTaskBase
{

  private final IndexSpec indexSpec;

  @JsonCreator
  public AppendTask(
      @JsonProperty("id") String id,
      @JsonProperty("dataSource") String dataSource,
      @JsonProperty("segments") List segments,
      @JsonProperty("indexSpec") IndexSpec indexSpec,
      @JsonProperty("context") Map context
  )
  {
    super(id, dataSource, segments, context);
    this.indexSpec = indexSpec == null ? new IndexSpec() : indexSpec;
  }

  @Override
  public File merge(final Map segments, final File outDir)
      throws Exception
  {
    VersionedIntervalTimeline timeline = new VersionedIntervalTimeline(
        Ordering.natural().nullsFirst()
    );

    for (DataSegment segment : segments.keySet()) {
      timeline.add(segment.getInterval(), segment.getVersion(), segment.getShardSpec().createChunk(segment));
    }

    final Iterable segmentsToMerge = Iterables.concat(
        Iterables.transform(
            timeline.lookup(new Interval("1000-01-01/3000-01-01")),
            new Function, Iterable>()
            {
              @Override
              public Iterable apply(final TimelineObjectHolder input)
              {
                return Iterables.transform(
                    input.getObject(),
                    new Function, SegmentToMergeHolder>()
                    {
                      @Nullable
                      @Override
                      public SegmentToMergeHolder apply(PartitionChunk chunkInput)
                      {
                        DataSegment segment = chunkInput.getObject();
                        return new SegmentToMergeHolder(
                            segment, input.getInterval(),
                            Preconditions.checkNotNull(
                                segments.get(segment),
                                "File for segment %s", segment.getIdentifier()
                            )
                        );
                      }
                    }
                );
              }
            }
        )
    );

    List adapters = Lists.newArrayList();

    for (final SegmentToMergeHolder holder : segmentsToMerge) {
      adapters.add(
          new RowboatFilteringIndexAdapter(
              new QueryableIndexIndexableAdapter(
                  IndexIO.loadIndex(holder.getFile())
              ),
              new Predicate()
              {
                @Override
                public boolean apply(Rowboat input)
                {
                  return holder.getInterval().contains(input.getTimestamp());
                }
              }
          )
      );
    }

    return IndexMerger.append(adapters, outDir, indexSpec);
  }

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

  private static class SegmentToMergeHolder
  {
    private final DataSegment segment;
    private final Interval interval;
    private final File file;

    private SegmentToMergeHolder(DataSegment segment, Interval interval, File file)
    {
      this.segment = segment;
      this.interval = interval;
      this.file = file;
    }

    public DataSegment getSegment()
    {
      return segment;
    }

    public Interval getInterval()
    {
      return interval;
    }

    public File getFile()
    {
      return file;
    }
  }
}