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LzoProtobufScheme.java
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LzoProtobufScheme.java
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package com.twitter.elephantbird.cascading2.scheme;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.Job;
import com.google.protobuf.Message;
import com.twitter.elephantbird.mapred.input.DeprecatedInputFormatWrapper;
import com.twitter.elephantbird.mapred.output.DeprecatedLzoProtobufBlockOutputFormat;
import com.twitter.elephantbird.mapreduce.input.MultiInputFormat;
import com.twitter.elephantbird.mapreduce.io.ProtobufWritable;
import com.twitter.elephantbird.util.Protobufs;
import com.twitter.elephantbird.util.TypeRef;
import cascading.flow.hadoop.HadoopFlowProcess;
import cascading.scheme.Scheme;
import cascading.tap.Tap;
import java.io.IOException;
/**
* Scheme for Protobuf lzo compressed files.
*
* @author Avi Bryant, Ning Liang
*/
public class LzoProtobufScheme<M extends Message> extends
LzoBinaryScheme<M, ProtobufWritable<M>> {
private static final long serialVersionUID = -5011096855302946105L;
private Class protoClass;
public LzoProtobufScheme(Class protoClass) {
this.protoClass = protoClass;
}
protected ProtobufWritable<M> prepareBinaryWritable() {
TypeRef<M> typeRef = (TypeRef<M>) Protobufs.getTypeRef(protoClass.getName());
return new ProtobufWritable(typeRef);
}
@Override
public void sinkConfInit(HadoopFlowProcess hfp, Tap tap, JobConf conf) {
conf.setOutputFormat(
DeprecatedLzoProtobufBlockOutputFormat.getOutputFormatClass(protoClass, conf)
);
}
@Override
public void sourceConfInit(HadoopFlowProcess hfp, Tap tap, JobConf conf) {
MultiInputFormat.setClassConf(protoClass, conf);
DeprecatedInputFormatWrapper.setInputFormat(MultiInputFormat.class, conf);
}
}