Skewed join use fewer reducer for extreme large key
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Key: PIG-1709
URL: https://issues.apache.org/jira/browse/PIG-1709
Project: Pig
Issue Type: Bug
Components: impl
Affects Versions: 0.8.0
Reporter: Daniel Dai
Assignee: Daniel Dai
Fix For: 0.9.0
In skewed join, we use PartitionSkewedKeys to calculate number of reducers
needed for a single key. If the result if larger than the number of total
reducers, we will round it with reducer#. Eg, if Pig calculates that we need 12
reducers to hold a key in memory, and total reducers for this job is 10, we
then allocate 2 reducers to this key; We shall use all 10 reducers in this case.
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