co.cask.cdap.internal.app.runtime.batch.dataset.output.MultipleOutputsCommitter.java Source code

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Here is the source code for co.cask.cdap.internal.app.runtime.batch.dataset.output.MultipleOutputsCommitter.java

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/*
 * Copyright  2015 Cask Data, 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 co.cask.cdap.internal.app.runtime.batch.dataset.output;

import com.google.common.collect.ImmutableMap;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.JobStatus;
import org.apache.hadoop.mapreduce.OutputCommitter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;

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

/**
 * OutputCommitter that delegates to a collection of other OutputFormatCommitters.
 */
public class MultipleOutputsCommitter extends OutputCommitter {

    private final Map<String, OutputCommitter> committers;

    public MultipleOutputsCommitter(Map<String, OutputCommitter> committers) {
        this.committers = ImmutableMap.copyOf(committers);
    }

    @Override
    public void setupJob(JobContext jobContext) throws IOException {
        for (Map.Entry<String, OutputCommitter> committer : committers.entrySet()) {
            JobContext namedJobContext = MultipleOutputs.getNamedJobContext(jobContext, committer.getKey());
            committer.getValue().setupJob(namedJobContext);
        }
    }

    @Override
    public void setupTask(TaskAttemptContext taskContext) throws IOException {
        for (Map.Entry<String, OutputCommitter> committer : committers.entrySet()) {
            TaskAttemptContext namedTaskContext = MultipleOutputs.getNamedTaskContext(taskContext,
                    committer.getKey());
            committer.getValue().setupTask(namedTaskContext);
        }
    }

    @Override
    public boolean needsTaskCommit(TaskAttemptContext taskContext) throws IOException {
        // needs task commit if any delegates need task commit
        for (Map.Entry<String, OutputCommitter> committer : committers.entrySet()) {
            TaskAttemptContext namedTaskContext = MultipleOutputs.getNamedTaskContext(taskContext,
                    committer.getKey());
            if (committer.getValue().needsTaskCommit(namedTaskContext)) {
                return true;
            }
        }
        return false;
    }

    @Override
    public void commitTask(TaskAttemptContext taskContext) throws IOException {
        for (Map.Entry<String, OutputCommitter> committer : committers.entrySet()) {
            TaskAttemptContext namedTaskContext = MultipleOutputs.getNamedTaskContext(taskContext,
                    committer.getKey());
            if (committer.getValue().needsTaskCommit(namedTaskContext)) {
                committer.getValue().commitTask(namedTaskContext);
            }
        }
    }

    @Override
    public void abortTask(TaskAttemptContext taskContext) throws IOException {
        for (Map.Entry<String, OutputCommitter> committer : committers.entrySet()) {
            TaskAttemptContext namedTaskContext = MultipleOutputs.getNamedTaskContext(taskContext,
                    committer.getKey());
            committer.getValue().abortTask(namedTaskContext);
        }
    }

    @Override
    public void commitJob(JobContext jobContext) throws IOException {
        for (Map.Entry<String, OutputCommitter> committer : committers.entrySet()) {
            JobContext namedJobContext = MultipleOutputs.getNamedJobContext(jobContext, committer.getKey());
            committer.getValue().commitJob(namedJobContext);
        }
    }

    @Override
    public void abortJob(JobContext jobContext, JobStatus.State state) throws IOException {
        for (Map.Entry<String, OutputCommitter> committer : committers.entrySet()) {
            JobContext namedJobContext = MultipleOutputs.getNamedJobContext(jobContext, committer.getKey());
            committer.getValue().abortJob(namedJobContext, state);
        }
    }

    @Override
    public boolean isRecoverySupported() {
        // recovery is supported if it is supported on all delegates
        for (OutputCommitter committer : committers.values()) {
            if (!committer.isRecoverySupported()) {
                return false;
            }
        }
        return true;
    }

    @Override
    public void recoverTask(TaskAttemptContext taskContext) throws IOException {
        for (Map.Entry<String, OutputCommitter> committer : committers.entrySet()) {
            TaskAttemptContext namedTaskContext = MultipleOutputs.getNamedTaskContext(taskContext,
                    committer.getKey());
            committer.getValue().recoverTask(namedTaskContext);
        }
    }
}