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  1. Hive
  2. HIVE-5095

Hive needs new operator walker for parallelization/optimization for tez

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: tez-branch
    • Fix Version/s: tez-branch
    • Component/s: Tez
    • Labels:
      None

      Description

      For tez to compute the number of reducers, we should be walking the operator tree in a topological fashion so that the reducers down the tree get the estimate from all parents. However, the current walkers in hive only walk the operator tree in a depth-first fashion. We need to add a new walker for the topological walk. Also, since information about the parent operators needs to be propagated on a per parent basis, we need to retain some context across operators to be passed to the child which the walker will co-ordinate.

      NO PRECOMMIT TESTS (this is wip for the tez branch)

        Attachments

        1. HIVE-5095.WIP.patch.txt
          47 kB
          Vikram Dixit K
        2. HIVE-5095.1.patch
          34 kB
          Gunther Hagleitner

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              • Assignee:
                vikram.dixit Vikram Dixit K
                Reporter:
                vikram.dixit Vikram Dixit K
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                • Created:
                  Updated:
                  Resolved: