hadoop TupleWritable 源码
haddop TupleWritable 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/join/TupleWritable.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.mapred.join;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.io.Writable;
/**
* Writable type storing multiple {@link org.apache.hadoop.io.Writable}s.
*
* This is *not* a general-purpose tuple type. In almost all cases, users are
* encouraged to implement their own serializable types, which can perform
* better validation and provide more efficient encodings than this class is
* capable. TupleWritable relies on the join framework for type safety and
* assumes its instances will rarely be persisted, assumptions not only
* incompatible with, but contrary to the general case.
*
* @see org.apache.hadoop.io.Writable
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class TupleWritable
extends org.apache.hadoop.mapreduce.lib.join.TupleWritable {
/**
* Create an empty tuple with no allocated storage for writables.
*/
public TupleWritable() {
super();
}
/**
* Initialize tuple with storage; unknown whether any of them contain
* "written" values.
*/
public TupleWritable(Writable[] vals) {
super(vals);
}
/**
* Record that the tuple contains an element at the position provided.
*/
void setWritten(int i) {
written.set(i);
}
/**
* Record that the tuple does not contain an element at the position
* provided.
*/
void clearWritten(int i) {
written.clear(i);
}
/**
* Clear any record of which writables have been written to, without
* releasing storage.
*/
void clearWritten() {
written.clear();
}
}
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