com.blackberry.logdriver.mapred.BinaryRecordWriter.java Source code

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Here is the source code for com.blackberry.logdriver.mapred.BinaryRecordWriter.java

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/** Copyright 2013 BlackBerry, 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. 
 */

/**
 * Record writer that writes bytes literally to a file.
 * <p>
 * Setting <code>output.file.extension</code> in the configuration will cause
 * a specific extension to be used.  The default is no extension.
 */
package com.blackberry.logdriver.mapred;

import java.io.IOException;
import java.util.Arrays;

import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordWriter;
import org.apache.hadoop.mapred.Reporter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class BinaryRecordWriter implements RecordWriter<BytesWritable, NullWritable> {
    private static final Logger LOG = LoggerFactory.getLogger(BinaryRecordWriter.class);

    private FSDataOutputStream out;

    public BinaryRecordWriter(JobConf job) {
        String extension = job.get("output.file.extension", "");

        String taskid = job.get("mapred.task.id");
        try {
            Path outputPath = BinaryOutputFormat.getTaskOutputPath(job, taskid + extension);

            FileSystem fs = FileSystem.get(job);
            LOG.info("Creating output path: {}", outputPath);
            out = fs.create(outputPath, true);
        } catch (IOException e) {
            LOG.error("Error creating output file.", e);
        }
    }

    @Override
    public void write(BytesWritable k, NullWritable v) throws IOException {
        if (k == null || k.getLength() == 0) {
            return;
        }

        byte[] data = Arrays.copyOfRange(k.getBytes(), 0, k.getLength());
        out.write(data);
    }

    @Override
    public void close(Reporter reporter) throws IOException {
        out.close();
    }
}