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  1. Pig
  2. PIG-844

PERFORMANCE: streaming data to the UDFs in foreach

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.7.0
    • Component/s: None
    • Labels:
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      Description

      Currently, Pig places the data passed to UDFs into a bag. This can cause the process to use more memory than actually needed as in many cases it would be better to push the data one tuple at a time to the UDFs.

      For the case where combiner is invoked, this might not be that important; however, for non-algebraic UDFs as well as other cases where combiner can't be used, this can provide significant memory improvement.

      Another possible use case is where the data is already grouped going into pig and we don't need to group it again.

      How this will effect UDF interface needs to be further discussed.

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            • Assignee:
              Unassigned
              Reporter:
              olgan Olga Natkovich
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              • Created:
                Updated:
                Resolved: