[jira] [Updated] (CASSANDRA-7796) Stop inheriting liveRatio/computedAt from previous memtables

["Aleksey Yeschenko (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-7796?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksey Yeschenko updated CASSANDRA-7796:
-----------------------------------------

    Attachment: 7796.txt

> Stop inheriting liveRatio/computedAt from previous memtables
> ------------------------------------------------------------
>
>                 Key: CASSANDRA-7796
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7796
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Aleksey Yeschenko
>            Assignee: Aleksey Yeschenko
>            Priority: Minor
>             Fix For: 2.0.10
>
>         Attachments: 7796.txt
>
>
> CASSANDRA-6945 helped to reduce the risk of calculating an outlier liveRatio value, and having to stick with it for a long time, by making liveRatio per-memtable and not per-cf.
> The added optimization of inheriting liveRatio/calculatedAt to minimize recalculations, however, took us a step back to before CASSANDRA-6945.
> I suggest we get rid of inheriting the old values altogether, but reduce the rate of recalculation by demanding 10x increase in ops to trigger recalc, instead of the previous 2x.



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