org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat Maven / Gradle / Ivy
/*
* 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.apache.hadoop.hive.ql.io;
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.FileSinkOperator.RecordWriter;
import org.apache.hadoop.hive.ql.exec.Utilities;
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 to TextOutputFormat.RecordWriter.
*
*/
public class HiveIgnoreKeyTextOutputFormat
extends TextOutputFormat implements HiveOutputFormat {
/**
* 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 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, progress), isCompressed);
return new RecordWriter() {
@Override
public void write(Writable r) throws IOException {
if (r instanceof Text) {
Text tr = (Text) r;
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);
}
}
@Override
public void close(boolean abort) throws IOException {
outStream.close();
}
};
}
protected static class IgnoreKeyWriter
implements org.apache.hadoop.mapred.RecordWriter {
private final org.apache.hadoop.mapred.RecordWriter mWriter;
public IgnoreKeyWriter(org.apache.hadoop.mapred.RecordWriter writer) {
this.mWriter = writer;
}
@Override
public synchronized void write(K key, V value) throws IOException {
this.mWriter.write(null, value);
}
@Override
public void close(Reporter reporter) throws IOException {
this.mWriter.close(reporter);
}
}
@Override
public org.apache.hadoop.mapred.RecordWriter getRecordWriter(
FileSystem ignored, JobConf job, String name, Progressable progress)
throws IOException {
return new IgnoreKeyWriter(super.getRecordWriter(ignored, job, name,
progress));
}
}