com.ibm.bi.dml.runtime.matrix.sort.CompactOutputFormat.java Source code

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Here is the source code for com.ibm.bi.dml.runtime.matrix.sort.CompactOutputFormat.java

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/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * 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 com.ibm.bi.dml.runtime.matrix.sort;

import java.io.DataOutputStream;
import java.io.IOException;

import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordWriter;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.util.Progressable;

public class CompactOutputFormat<K extends Writable, V extends Writable> extends FileOutputFormat<K, V> {

    static final String FINAL_SYNC_ATTRIBUTE = "final.sync";

    /**
     * Set the requirement for a final sync before the stream is closed.
     */
    public static void setFinalSync(JobConf conf, boolean newValue) {
        conf.setBoolean(FINAL_SYNC_ATTRIBUTE, newValue);
    }

    /**
     * Does the user want a final sync at close?
     */
    public static boolean getFinalSync(JobConf conf) {
        return conf.getBoolean(FINAL_SYNC_ATTRIBUTE, false);
    }

    public RecordWriter<K, V> getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress)
            throws IOException {

        Path file = FileOutputFormat.getTaskOutputPath(job, name);
        FileSystem fs = file.getFileSystem(job);
        FSDataOutputStream fileOut = fs.create(file, progress);
        return new FixedLengthRecordWriter<K, V>(fileOut, job);
    }

    public static class FixedLengthRecordWriter<K extends Writable, V extends Writable>
            implements RecordWriter<K, V> {

        private DataOutputStream out;
        private boolean finalSync = false;

        public FixedLengthRecordWriter(DataOutputStream out, JobConf conf) {
            this.out = out;
            finalSync = getFinalSync(conf);
        }

        @Override
        @SuppressWarnings("deprecation")
        public void close(Reporter reporter) throws IOException {
            if (finalSync) {
                ((FSDataOutputStream) out).sync();
            }
            out.close();
        }

        @Override
        public void write(K key, V value) throws IOException {
            key.write(out);
            value.write(out);
        }

    }

}