Radim Kolar created MAPREDUCE-4827:
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Summary: Increase hash quality of HashPartitioner
Key: MAPREDUCE-4827
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4827
Project: Hadoop Map/Reduce
Issue Type: Improvement
Reporter: Radim Kolar
hash partitioner is using object.hashCode() for splitting keys into partitions.
This results in bad distributions because hashCode() quality is poor.
These hashCode() functions are sometimes written by hand (very poor quality)
and sometimes generated from by commons lang code (poor quality). Applying some
transformation on top of hashCode() provides better distribution.
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