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Support compression for output in MR v1. #147

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Support compression for output in MR v1. #147

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21 changes: 16 additions & 5 deletions hadoop/src/main/java/org/tensorflow/hadoop/io/TFRecordFileOutputFormatV1.java
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Original file line number Diff line number Diff line change
Expand Up @@ -19,27 +19,39 @@
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.io.Writable;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.hadoop.io.compress.GzipCodec;
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;
import org.apache.hadoop.util.ReflectionUtils;
import org.tensorflow.hadoop.util.TFRecordWriter;

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

public class TFRecordFileOutputFormatV1 extends FileOutputFormat<BytesWritable, Writable> {
@Override
public RecordWriter<BytesWritable, Writable> getRecordWriter(FileSystem ignored,
JobConf job, String name,
Progressable progress) throws IOException {
Path file = FileOutputFormat.getTaskOutputPath(job, name);
boolean isCompressed = getCompressOutput(job);
CompressionCodec codec = null;
String extension = "";
if (isCompressed) {
Class<? extends CompressionCodec> codecClass = getOutputCompressorClass(job, GzipCodec.class);
codec = ReflectionUtils.newInstance(codecClass, job);
extension = codec.getDefaultExtension();
}
Path file = FileOutputFormat.getTaskOutputPath(job, name + extension);
FileSystem fs = file.getFileSystem(job);

int bufferSize = TFRecordIOConf.getBufferSize(job);
final FSDataOutputStream fsdos = fs.create(file, true, bufferSize);
FSDataOutputStream fsDataOutputStream = fs.create(file, true, bufferSize);
final DataOutputStream fsdos = isCompressed ?
new DataOutputStream(codec.createOutputStream(fsDataOutputStream)) : fsDataOutputStream;
final TFRecordWriter writer = new TFRecordWriter(fsdos);
return new RecordWriter<BytesWritable, Writable>() {
@Override
Expand All @@ -55,5 +67,4 @@ public void close(Reporter reporter)
}
};
}

}