Rohini Palaniswamy created PIG-3775:
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Summary: Use unsorted shuffle in Union, Orderby, Skewed Join to
improve performance
Key: PIG-3775
URL: https://issues.apache.org/jira/browse/PIG-3775
Project: Pig
Issue Type: Sub-task
Reporter: Rohini Palaniswamy
When implementing Pig union, we need to gather data from two or more upstream
vertexes without sorting. The vertex itself might consists of several tasks.
Same can be done for the partitioner vertex in orderby and skewed join instead
of 1-1 edge for some cases of parallelism.
TEZ-661 has been created to add custom output and input for that in Tez. It is
currently not in the Tez team priorities but it is important for us as it will
give good performance gains. We can write the custom input/output and
contribute it to Tez and make the corresponding changes in Pig. Marking this as
a candidate for GSOC 2014.
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