PERFORMANCE: different strategies for large and small order bys
---------------------------------------------------------------
Key: PIG-483
URL: https://issues.apache.org/jira/browse/PIG-483
Project: Pig
Issue Type: Improvement
Affects Versions: types_branch
Reporter: Olga Natkovich
Fix For: types_branch
Currently pig always does a multi-pass order by where it first determines a
distribution for the keys and then orders in a second pass. This avoids the
necessity of having a single reducer. However, in cases where the data is
small enough to fit into a single reducer, this is inefficient. For small data
sets it would be good to realize the small size of the set and do the order by
in a single pass with a single reducer.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
