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

["Alexey Serbin (Jira)" <ji...@apache.org>]

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

Alexey Serbin reassigned KUDU-1587:
-----------------------------------

    Assignee: Alexey Serbin

> 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
>            Assignee: Alexey Serbin
>            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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