[jira] [Commented] (KUDU-2726) Very large tablets defeat budgeted compaction

["Will Berkeley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KUDU-2726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16783840#comment-16783840 ] 

Will Berkeley commented on KUDU-2726:
-------------------------------------

This can be worked around by increasing the compaction budget {{--tablet_compaction_budget_mb}}.

It's also possible to work around it by decreasing the minimum improvement score, but I don't recommend that because KUDU-1400 compaction depends on a careful balance between the minimum score and the coefficient balancing the KUDU-1400 component of the score and the "regular" rowset height reduction score.

> Very large tablets defeat budgeted compaction
> ---------------------------------------------
>
>                 Key: KUDU-2726
>                 URL: https://issues.apache.org/jira/browse/KUDU-2726
>             Project: Kudu
>          Issue Type: Improvement
>    Affects Versions: 1.9.0
>            Reporter: Will Berkeley
>            Priority: Major
>
> On very large tablets (50GB+), despite being very uncompacted with a large average rowset height, a default budget (128MB) worth of compaction may not reduce average rowset height enough to pass the minimum threshold. Thus the tablet stays uncompacted forever.



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