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Posted to issues@impala.apache.org by "Tim Armstrong (JIRA)" <ji...@apache.org> on 2017/07/24 17:58:00 UTC

[jira] [Created] (IMPALA-5704) Parallelise read I/O for spilling operators where it is currently sequential

Tim Armstrong created IMPALA-5704:
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             Summary: Parallelise read I/O for spilling operators where it is currently sequential
                 Key: IMPALA-5704
                 URL: https://issues.apache.org/jira/browse/IMPALA-5704
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
    Affects Versions: Impala 2.10.0
            Reporter: Tim Armstrong


After IMPALA-3200 goes in, we can make improvements to the performance of spilling operators by exploiting the new async pin behaviour of IMPALA-5169. There are several known cases where read I/O is not effectively overlapped with compute, and multiple disks are not used effectively by doing multiple I/Os concurrently



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