org.apache.hadoop.mapreduce.lib.reduce

クラス LongSumReducer<KEY>

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<KEY,LongWritable,KEY,LongWritable>

org.apache.hadoop.mapreduce.lib.reduce.LongSumReducer<KEY>

@InterfaceAudience.Public
 @InterfaceStability.Stable
public class LongSumReducer<KEY>
extends Reducer<KEY,LongWritable,KEY,LongWritable>

コンストラクタのサマリー

コンストラクタ

コンストラクタと説明
LongSumReducer()

メソッドのサマリー

修飾子とタイプ	メソッドと説明
void	reduce(KEY key, Iterable<LongWritable> values, org.apache.hadoop.mapreduce.Reducer.Context context) This method is called once for each key.

クラスから継承されたメソッド org.apache.hadoop.mapreduce.Reducer

cleanup, run, setup

クラスから継承されたメソッド java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

コンストラクタの詳細

LongSumReducer

public LongSumReducer()

メソッドの詳細

reduce

public void reduce(KEY key,
                   Iterable<LongWritable> values,
                   org.apache.hadoop.mapreduce.Reducer.Context context)
            throws IOException,
                   InterruptedException

クラスからコピーされた説明: Reducer

This method is called once for each key. Most applications will define their reduce class by overriding this method. The default implementation is an identity function.

オーバーライド:

reduce クラス内 Reducer<KEY,LongWritable,KEY,LongWritable>

例外:

IOException

InterruptedException