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