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  1. Tajo
  2. TAJO-691

HashJoin or HashAggregation is too slow if there is many unique keys

    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.8.0, 0.9.0
    • Component/s: None
    • Labels:
      None

      Description

      HashJoin or HashAggregation is too slow if there is many unique keys.
      Java's native Map is inefficient to handle many items. In case more than 1 million items in HashMap, Adding 10000 items takes more than 7 ~ 10 seconds.
      This should be improved.

        Attachments

        1. TAJO-691.patch
          6 kB
          Hyoungjun Kim
        2. TAJO-691_2.patch
          13 kB
          Hyunsik Choi

          Activity

            People

            • Assignee:
              hjkim Hyoungjun Kim
              Reporter:
              hjkim Hyoungjun Kim
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              Dates

              • Created:
                Updated:
                Resolved: