org.apache.druid.indexing.appenderator.ActionBasedUsedSegmentChecker.java Source code

Introduction

Here is the source code for org.apache.druid.indexing.appenderator.ActionBasedUsedSegmentChecker.java

Source

/*
 * 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.appenderator;

import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import org.apache.druid.indexing.common.actions.SegmentListUsedAction;
import org.apache.druid.indexing.common.actions.TaskActionClient;
import org.apache.druid.java.util.common.JodaUtils;
import org.apache.druid.segment.realtime.appenderator.SegmentIdentifier;
import org.apache.druid.segment.realtime.appenderator.UsedSegmentChecker;
import org.apache.druid.timeline.DataSegment;
import org.joda.time.Interval;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class ActionBasedUsedSegmentChecker implements UsedSegmentChecker {
    private final TaskActionClient taskActionClient;

    public ActionBasedUsedSegmentChecker(TaskActionClient taskActionClient) {
        this.taskActionClient = taskActionClient;
    }

    @Override
    public Set<DataSegment> findUsedSegments(Set<SegmentIdentifier> identifiers) throws IOException {
        // Group by dataSource
        final Map<String, Set<SegmentIdentifier>> identifiersByDataSource = Maps.newTreeMap();
        for (SegmentIdentifier identifier : identifiers) {
            if (!identifiersByDataSource.containsKey(identifier.getDataSource())) {
                identifiersByDataSource.put(identifier.getDataSource(), Sets.newHashSet());
            }
            identifiersByDataSource.get(identifier.getDataSource()).add(identifier);
        }

        final Set<DataSegment> retVal = Sets.newHashSet();

        for (Map.Entry<String, Set<SegmentIdentifier>> entry : identifiersByDataSource.entrySet()) {
            final List<Interval> intervals = JodaUtils.condenseIntervals(
                    Iterables.transform(entry.getValue(), new Function<SegmentIdentifier, Interval>() {
                        @Override
                        public Interval apply(SegmentIdentifier input) {
                            return input.getInterval();
                        }
                    }));

            final List<DataSegment> usedSegmentsForIntervals = taskActionClient
                    .submit(new SegmentListUsedAction(entry.getKey(), null, intervals));

            for (DataSegment segment : usedSegmentsForIntervals) {
                if (identifiers.contains(SegmentIdentifier.fromDataSegment(segment))) {
                    retVal.add(segment);
                }
            }
        }

        return retVal;
    }
}