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Posted to issues-all@impala.apache.org by "Tim Armstrong (JIRA)" <ji...@apache.org> on 2018/08/29 17:45:00 UTC

[jira] [Work started] (IMPALA-7446) Queries can spill earlier than necessary because of accumulation of free buffers and clean pages

     [ https://issues.apache.org/jira/browse/IMPALA-7446?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on IMPALA-7446 started by Tim Armstrong.
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> Queries can spill earlier than necessary because of accumulation of free buffers and clean pages
> ------------------------------------------------------------------------------------------------
>
>                 Key: IMPALA-7446
>                 URL: https://issues.apache.org/jira/browse/IMPALA-7446
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>    Affects Versions: Impala 2.10.0, Impala 2.11.0, Impala 3.0, Impala 2.12.0
>            Reporter: Tim Armstrong
>            Assignee: Tim Armstrong
>            Priority: Critical
>              Labels: resource-management
>
> See IMPALA-7442 for an example where the query started to spill even when memory could have been made available by freeing buffers or evicting clean pages. Usually this would just result in spilling earlier than necessary, but in the case of IMPALA-7442 it lead to a query failure.
> My original intent was that BufferPool::ReleaseMemory() should be called in situations like this, but that was not done.



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