Status: Patch Available
Affects Version/s: 0.13.0
Fix Version/s: None
This may be controversial, so I'd like others' opinions on this.
It is not currently possible to disable the combiner and use map-side aggregation at the same time. This is a problematic since map-side aggregation effectively combines in the mapper, so running the combiner adds expensive combiner execution (combiner requires deserialization & reserialization) for little to no value.
PIG-2829 had a patch to disable the combiner when map-side aggregation is used (along with some other changes). This was never integrated because the map-side aggregation code was redone while this was in progress.
|Status||Open [ 1 ]||Patch Available [ 10002 ]|
|Transition||Time In Source Status||Execution Times||Last Executer||Last Execution Date|
|8m 29s||1||Travis Woodruff||09/Jun/14 20:25|