'group all' should always use one reducer
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Key: PIG-1617
URL: https://issues.apache.org/jira/browse/PIG-1617
Project: Pig
Issue Type: Improvement
Affects Versions: 0.8.0
Reporter: Thejas M Nair
Assignee: Thejas M Nair
Fix For: 0.8.0
'group all' sends all rows to a single reducer, it does not make sense to spawn
more than one reducer for it. But if higher value of parallelism is specified
or if the input is large enough so that changes in PIG-1249 result in larger
value being set, there are additional reducers spawned that don't do anything
useful.
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