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日 02 八月 2015 by Ryan Tao. Hadoop 2.4 Partitioner源码分析. 四 30 七月 2015 by Ryan Tao. Public int getPartition(K key, V value, int numReduceTasks) { return (key.hashCode() and Integer.MAX VALUE) % numReduceTasks; }. Public void configure(JobConf job) { instance = Hash.getInstance(job); } @override public int getPartition(K key, V value,int numReduceTasks) { return Math.abs(instance.hash . Hadoop 2.4 TextInputfomat源码分析. 四 30 七月 2015 by Ryan Tao. Hadoop 2.4 TextOutputFormat源码分析. 四 30 七月 2015 by Ryan Tao. Override...

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Ryan's Blog | coolhadoop.com Reviews
<META>
DESCRIPTION
日 02 八月 2015 by Ryan Tao. Hadoop 2.4 Partitioner源码分析. 四 30 七月 2015 by Ryan Tao. Public int getPartition(K key, V value, int numReduceTasks) { return (key.hashCode() and Integer.MAX VALUE) % numReduceTasks; }. Public void configure(JobConf job) { instance = Hash.getInstance(job); } @override public int getPartition(K key, V value,int numReduceTasks) { return Math.abs(instance.hash . Hadoop 2.4 TextInputfomat源码分析. 四 30 七月 2015 by Ryan Tao. Hadoop 2.4 TextOutputFormat源码分析. 四 30 七月 2015 by Ryan Tao. Override...
<META>
KEYWORDS
1 ryan's blog
2 这两天犯的低级错误
3 1写完mapper忘改partitioner,导致类型错误,真是低级透了
4 2粘贴配置文件,看着没事,实际上有特殊字符,一直不生效,重新手打一遍好了
5 3配置文件写错单位
6 partitioner的方法只有一个,就是getpartition
7 来看默认的hashpartitioner
8 如果我们想自定义partitioner重写这个方法就可以
9 hadoop自身也带了一个hash类,我们可以使用其中的hash方法
10 而解析text用的是linerecordreader
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ryan's blog,这两天犯的低级错误,1写完mapper忘改partitioner,导致类型错误,真是低级透了,2粘贴配置文件,看着没事,实际上有特殊字符,一直不生效,重新手打一遍好了,3配置文件写错单位,partitioner的方法只有一个,就是getpartition,来看默认的hashpartitioner,如果我们想自定义partitioner重写这个方法就可以,hadoop自身也带了一个hash类,我们可以使用其中的hash方法,而解析text用的是linerecordreader
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Ryan's Blog | coolhadoop.com Reviews

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日 02 八月 2015 by Ryan Tao. Hadoop 2.4 Partitioner源码分析. 四 30 七月 2015 by Ryan Tao. Public int getPartition(K key, V value, int numReduceTasks) { return (key.hashCode() and Integer.MAX VALUE) % numReduceTasks; }. Public void configure(JobConf job) { instance = Hash.getInstance(job); } @override public int getPartition(K key, V value,int numReduceTasks) { return Math.abs(instance.hash . Hadoop 2.4 TextInputfomat源码分析. 四 30 七月 2015 by Ryan Tao. Hadoop 2.4 TextOutputFormat源码分析. 四 30 七月 2015 by Ryan Tao. Override...

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日 02 八月 2015 by Ryan Tao. Hadoop 2.4 Partitioner源码分析. 四 30 七月 2015 by Ryan Tao. Public int getPartition(K key, V value, int numReduceTasks) { return (key.hashCode() and Integer.MAX VALUE) % numReduceTasks; }. Public void configure(JobConf job) { instance = Hash.getInstance(job); } @override public int getPartition(K key, V value,int numReduceTasks) { return Math.abs(instance.hash . Hadoop 2.4 TextInputfomat源码分析. 四 30 七月 2015 by Ryan Tao. Hadoop 2.4 TextOutputFormat源码分析. 四 30 七月 2015 by Ryan Tao. Override...

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