org.platform.modules.hadoop.format.output.CustomOutputFormat.java Source code

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Here is the source code for org.platform.modules.hadoop.format.output.CustomOutputFormat.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 org.platform.modules.hadoop.format.output;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Properties;

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.exec.Utilities;
import org.apache.hadoop.hive.ql.exec.FileSinkOperator.RecordWriter;
import org.apache.hadoop.hive.ql.io.HiveOutputFormat;
import org.apache.hadoop.hive.serde.serdeConstants;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.TextOutputFormat;
import org.apache.hadoop.util.Progressable;

/**
 * HiveIgnoreKeyTextOutputFormat replaces key with null before feeding the <key,
 * value> to TextOutputFormat.RecordWriter.
 * 
 */
@SuppressWarnings({ "rawtypes" })
public class CustomOutputFormat<K extends WritableComparable, V extends Writable> extends TextOutputFormat<K, V>
        implements HiveOutputFormat<K, V> {

    /**
     * create the final out file, and output row by row. After one row is
     * appended, a configured row separator is appended
     * 
     * @param jc
     *          the job configuration file
     * @param outPath
     *          the final output file to be created
     * @param valueClass
     *          the value class used for create
     * @param isCompressed
     *          whether the content is compressed or not
     * @param tableProperties
     *          the tableProperties of this file's corresponding table
     * @param progress
     *          progress used for status report
     * @return the RecordWriter
     */
    @Override
    public RecordWriter getHiveRecordWriter(JobConf jc, Path outPath, Class<? extends Writable> valueClass,
            boolean isCompressed, Properties tableProperties, Progressable progress) throws IOException {
        int rowSeparator = 0;
        String rowSeparatorString = tableProperties.getProperty(serdeConstants.LINE_DELIM, "\n");
        try {
            rowSeparator = Byte.parseByte(rowSeparatorString);
        } catch (NumberFormatException e) {
            rowSeparator = rowSeparatorString.charAt(0);
        }

        final int finalRowSeparator = rowSeparator;
        FileSystem fs = outPath.getFileSystem(jc);
        final OutputStream outStream = Utilities.createCompressedStream(jc, fs.create(outPath), isCompressed);
        return new RecordWriter() {
            @SuppressWarnings("deprecation")
            public void write(Writable r) throws IOException {
                if (r instanceof Text) {
                    Text tr = (Text) r;
                    String strReplace = tr.toString().toLowerCase().replace(":", "::");
                    Text txtReplace = new Text();
                    txtReplace.set(strReplace);
                    outStream.write(txtReplace.getBytes(), 0, txtReplace.getLength());
                    //          outStream.write(tr.getBytes(), 0, tr.getLength());
                    outStream.write(finalRowSeparator);
                } else {
                    // DynamicSerDe always writes out BytesWritable
                    BytesWritable bw = (BytesWritable) r;
                    outStream.write(bw.get(), 0, bw.getSize());
                    outStream.write(finalRowSeparator);
                }
            }

            public void close(boolean abort) throws IOException {
                outStream.close();
            }
        };
    }

    protected static class IgnoreKeyWriter<K extends WritableComparable, V extends Writable>
            implements org.apache.hadoop.mapred.RecordWriter<K, V> {

        private final org.apache.hadoop.mapred.RecordWriter<K, V> mWriter;

        public IgnoreKeyWriter(org.apache.hadoop.mapred.RecordWriter<K, V> writer) {
            this.mWriter = writer;
        }

        public synchronized void write(K key, V value) throws IOException {
            this.mWriter.write(null, value);
        }

        public void close(Reporter reporter) throws IOException {
            this.mWriter.close(reporter);
        }
    }

    @Override
    public org.apache.hadoop.mapred.RecordWriter<K, V> getRecordWriter(FileSystem ignored, JobConf job, String name,
            Progressable progress) throws IOException {

        return new IgnoreKeyWriter<K, V>(super.getRecordWriter(ignored, job, name, progress));
    }

}