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

["Tim Armstrong (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-5704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Armstrong updated IMPALA-5704:
----------------------------------
    Priority: Minor  (was: Major)

> 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
>            Priority: Minor
>              Labels: performance
>
> 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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