[jira] [Created] (PIG-3775) Use unsorted shuffle in Union, Orderby, Skewed Join to improve performance

["Rohini Palaniswamy (JIRA)" <ji...@apache.org>]

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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