com.inmobi.conduit.distcp.tools.mapred.CopyOutputFormat.java Source code

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Here is the source code for com.inmobi.conduit.distcp.tools.mapred.CopyOutputFormat.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 com.inmobi.conduit.distcp.tools.mapred;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.*;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.mapreduce.security.TokenCache;

import com.inmobi.conduit.distcp.tools.DistCpConstants;
import com.inmobi.conduit.distcp.tools.util.HadoopCompat;

import java.io.IOException;

public class CopyOutputFormat<K, V> extends TextOutputFormat<K, V> {

    public static void setWorkingDirectory(Job job, Path workingDirectory) {
        job.getConfiguration().set(DistCpConstants.CONF_LABEL_TARGET_WORK_PATH, workingDirectory.toString());
    }

    public static void setCommitDirectory(Job job, Path commitDirectory) {
        job.getConfiguration().set(DistCpConstants.CONF_LABEL_TARGET_FINAL_PATH, commitDirectory.toString());
    }

    public static Path getWorkingDirectory(Job job) {
        return getWorkingDirectory(job.getConfiguration());
    }

    private static Path getWorkingDirectory(Configuration conf) {
        String workingDirectory = conf.get(DistCpConstants.CONF_LABEL_TARGET_WORK_PATH);
        if (workingDirectory == null || workingDirectory.isEmpty()) {
            return null;
        } else {
            return new Path(workingDirectory);
        }
    }

    public static Path getCommitDirectory(Job job) {
        return getCommitDirectory(job.getConfiguration());
    }

    private static Path getCommitDirectory(Configuration conf) {
        String commitDirectory = conf.get(DistCpConstants.CONF_LABEL_TARGET_FINAL_PATH);
        if (commitDirectory == null || commitDirectory.isEmpty()) {
            return null;
        } else {
            return new Path(commitDirectory);
        }
    }

    @Override
    public OutputCommitter getOutputCommitter(TaskAttemptContext context) throws IOException {
        return new CopyCommitter(getOutputPath(context), context);
    }

    @Override
    public void checkOutputSpecs(JobContext context) throws IOException {
        Configuration conf = HadoopCompat.getConfiguration(context);

        if (getCommitDirectory(conf) == null) {
            throw new IllegalStateException("Commit directory not configured");
        }

        Path workingPath = getWorkingDirectory(conf);
        if (workingPath == null) {
            throw new IllegalStateException("Working directory not configured");
        }

        // get delegation token for outDir's file system
        TokenCache.obtainTokensForNamenodes(HadoopCompat.getCredentials(context), new Path[] { workingPath }, conf);
    }
}