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java.lang.Objectorg.apache.hadoop.mapreduce.Partitioner<SecondarySort.IntPair,IntWritable>
org.apache.hadoop.examples.SecondarySort.FirstPartitioner
public static class SecondarySort.FirstPartitioner
Partition based on the first part of the pair.
Constructor Summary | |
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SecondarySort.FirstPartitioner()
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Method Summary | |
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int |
getPartition(SecondarySort.IntPair key,
IntWritable value,
int numPartitions)
Get the partition number for a given key (hence record) given the total number of partitions i.e. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public SecondarySort.FirstPartitioner()
Method Detail |
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public int getPartition(SecondarySort.IntPair key, IntWritable value, int numPartitions)
Partitioner
Typically a hash function on a all or a subset of the key.
getPartition
in class Partitioner<SecondarySort.IntPair,IntWritable>
key
- the key to be partioned.value
- the entry value.numPartitions
- the total number of partitions.
key
.
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