hadoop TypedBytesInputWriter 源码
haddop TypedBytesInputWriter 代码
文件路径：/hadoop-tools/hadoop-streaming/src/main/java/org/apache/hadoop/streaming/io/TypedBytesInputWriter.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.DataOutput;
import java.io.IOException;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.streaming.PipeMapRed;
import org.apache.hadoop.typedbytes.TypedBytesOutput;
import org.apache.hadoop.typedbytes.TypedBytesWritableOutput;
/**
* InputWriter that writes the client's input as typed bytes.
*/
public class TypedBytesInputWriter extends InputWriter<Object, Object> {
private TypedBytesOutput tbOut;
private TypedBytesWritableOutput tbwOut;
@Override
public void initialize(PipeMapRed pipeMapRed) throws IOException {
super.initialize(pipeMapRed);
DataOutput clientOut = pipeMapRed.getClientOutput();
tbOut = new TypedBytesOutput(clientOut);
tbwOut = new TypedBytesWritableOutput(clientOut);
}
@Override
public void writeKey(Object key) throws IOException {
writeTypedBytes(key);
}
@Override
public void writeValue(Object value) throws IOException {
writeTypedBytes(value);
}
private void writeTypedBytes(Object value) throws IOException {
if (value instanceof Writable) {
tbwOut.write((Writable) value);
} else {
tbOut.write(value);
}
}
}
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