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  1. Crunch
  2. CRUNCH-437

Fix Crunch Spark duplicate value aggregation

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.8.4, 0.11.0
    • Component/s: None
    • Labels:
      None

      Description

      The current Crunch-on-Spark mapside combiner uses a Multimap of key-value pairs to cache values for local aggregation. This is awesome, except it means that identical key-value outputs before a shuffle will only have one copy in the Multimap, which means that the aggregation counts may not be correct. We should fix it to use a proper Map<K, List<V>> to ensure that duplicate values are aggregated correctly.

        Attachments

        1. CRUNCH-437.patch
          7 kB
          Josh Wills

          Activity

            People

            • Assignee:
              Unassigned
              Reporter:
              jwills Josh Wills
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              Dates

              • Created:
                Updated:
                Resolved: