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Posted to issues@kudu.apache.org by "Grant Henke (Jira)" <ji...@apache.org> on 2020/06/01 20:53:00 UTC

[jira] [Updated] (KUDU-1587) Memory-based backpressure is insufficient on seek-bound workloads

     [ https://issues.apache.org/jira/browse/KUDU-1587?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Grant Henke updated KUDU-1587:
------------------------------
    Labels: roadmap-candidate  (was: )

> Memory-based backpressure is insufficient on seek-bound workloads
> -----------------------------------------------------------------
>
>                 Key: KUDU-1587
>                 URL: https://issues.apache.org/jira/browse/KUDU-1587
>             Project: Kudu
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 0.10.0
>            Reporter: Todd Lipcon
>            Priority: Critical
>              Labels: roadmap-candidate
>         Attachments: graph.png, queue-time.png
>
>
> I pushed a uniform random insert workload from a bunch of clients to the point that the vast majority of bloom filters no longer fit in buffer cache, and the compaction had fallen way behind. Thus, every inserted row turns into 40+ seeks (due to non-compact data) and takes 400-500ms. In this kind of workload, the current backpressure (based on memory usage) is insufficient to prevent ridiculously long queues.



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