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  1. Hive
  2. HIVE-1486

optimize estimation of number of reducers and local mode

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    • Improvement
    • Status: Open
    • Major
    • Resolution: Unresolved
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    Description

      Hive uses file system metadata to estimate number of reducers and to determine if jobs can be executed locally. This currently looks up file system metadata about each path serially and can take a long time in case number of files is very high.

      instead we can lookup part of the input space and try to approximate the size etc. summaries

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          relates to

          Improvement - An improvement or enhancement to an existing feature or task. HIVE-17004 Calculating Number Of Reducers Looks At All Files

          • Major - Major loss of function.
          • Open

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              Unassigned Unassigned
              jsensarma Joydeep Sen Sarma
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                Created:
                Updated: