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  1. IMPALA
  2. IMPALA-3902 Multi-threaded query execution
  3. IMPALA-4008

Generate codegen module without operator/query-specific constants

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    Details

    • Type: Sub-task
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: Impala 2.7.0
    • Fix Version/s: Impala 2.8.0
    • Component/s: Backend
    • Labels:

      Description

      Codegen'd code currently has certain operator-specific constants baked into it. E.g. the HashTableCtx address. This limits flexibility if we want to e.g. cache codegen'd objects or share codegen'd objects between different fragment instances.

      I attached a proof-of-concept codegen caching implementation based on the LLVM bitcode generated by the operators. It's interesting because a cache hit implies that the codegen'd module content was identical.

        Attachments

        1. 0001-Codegen-caching-PoC.patch
          8 kB
          Tim Armstrong

          Issue Links

          blocks

          Improvement - An improvement or enhancement to an existing feature or task. IMPALA-4080 Share codegen work between fragment instances

          • Major - Major loss of function.
          • Resolved

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              • Assignee:
                kwho Michael Ho
                Reporter:
                tarmstrong Tim Armstrong
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                Dates

                • Created:
                  Updated:
                  Resolved: