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Posted to issues@kudu.apache.org by "Alexey Serbin (Jira)" <ji...@apache.org> on 2020/08/16 05:22:00 UTC

[jira] [Resolved] (KUDU-3181) Compilation manager queue may have too many tasks

     [ https://issues.apache.org/jira/browse/KUDU-3181?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexey Serbin resolved KUDU-3181.
---------------------------------
    Fix Version/s: 1.13.0
       Resolution: Fixed

> Compilation manager queue may have too many tasks
> -------------------------------------------------
>
>                 Key: KUDU-3181
>                 URL: https://issues.apache.org/jira/browse/KUDU-3181
>             Project: Kudu
>          Issue Type: Bug
>          Components: codegen
>            Reporter: Li Zhiming
>            Priority: Major
>             Fix For: 1.13.0
>
>         Attachments: heap.svg
>
>
> When a client frequently scanning for thousands of diffrent columns, the code_cache_hits rate is quite low. Then compilation task is frequently submitted to queue, but the compiler manager thread cannot consumes the queue quick enough. The queue could accumulate tons of entries, each of which retains a copy of schema meta data, so a lot of memeory is consumed for a long time.



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