hadoop RawBytesInputWriter 源码
haddop RawBytesInputWriter 代码
文件路径：/hadoop-tools/hadoop-streaming/src/main/java/org/apache/hadoop/streaming/io/RawBytesInputWriter.java
/**
* 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.streaming.io;
import java.io.ByteArrayOutputStream;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.IOException;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.streaming.PipeMapRed;
/**
* InputWriter that writes the client's input as raw bytes.
*/
public class RawBytesInputWriter extends InputWriter<Writable, Writable> {
private DataOutput clientOut;
private ByteArrayOutputStream bufferOut;
private DataOutputStream bufferDataOut;
@Override
public void initialize(PipeMapRed pipeMapRed) throws IOException {
super.initialize(pipeMapRed);
clientOut = pipeMapRed.getClientOutput();
bufferOut = new ByteArrayOutputStream();
bufferDataOut = new DataOutputStream(bufferOut);
}
@Override
public void writeKey(Writable key) throws IOException {
writeRawBytes(key);
}
@Override
public void writeValue(Writable value) throws IOException {
writeRawBytes(value);
}
private void writeRawBytes(Writable writable) throws IOException {
if (writable instanceof BytesWritable) {
BytesWritable bw = (BytesWritable) writable;
byte[] bytes = bw.getBytes();
int length = bw.getLength();
clientOut.writeInt(length);
clientOut.write(bytes, 0, length);
} else {
bufferOut.reset();
writable.write(bufferDataOut);
byte[] bytes = bufferOut.toByteArray();
clientOut.writeInt(bytes.length);
clientOut.write(bytes);
}
}
}
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