hadoop UniqValueCount 源码
haddop UniqValueCount 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/lib/aggregate/UniqValueCount.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.lib.aggregate;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* This class implements a value aggregator that dedupes a sequence of objects.
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class UniqValueCount
extends org.apache.hadoop.mapreduce.lib.aggregate.UniqValueCount
implements ValueAggregator<Object> {
/**
* the default constructor
*
*/
public UniqValueCount() {
super();
}
/**
* constructor
* @param maxNum the limit in the number of unique values to keep.
*
*/
public UniqValueCount(long maxNum) {
super(maxNum);
}
}
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