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Posted to issues@kudu.apache.org by "Grant Henke (JIRA)" <ji...@apache.org> on 2018/02/16 15:53:00 UTC

[jira] [Updated] (KUDU-18) Handle "slow readers" not holding too much memory

     [ https://issues.apache.org/jira/browse/KUDU-18?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Grant Henke updated KUDU-18:
----------------------------
    Target Version/s: 1.8.0  (was: 1.5.0)

> Handle "slow readers" not holding too much memory
> -------------------------------------------------
>
>                 Key: KUDU-18
>                 URL: https://issues.apache.org/jira/browse/KUDU-18
>             Project: Kudu
>          Issue Type: Improvement
>          Components: tablet
>    Affects Versions: M3
>            Reporter: Todd Lipcon
>            Priority: Major
>
> Currently if a scanner is held open, it can hold on to resources from the tablet indefinitely. This includes memory resources like MemRowSet/DeltaMemStore which can be quite large. We should figure out a way to forceably expire slow scanners or otherwise migrate them to the flushed copies.



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