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https://issues.apache.org/jira/browse/HBASE-26987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17531999#comment-17531999
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Zheng Wang commented on HBASE-26987:
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BTW, this issue seems introduced by HBASE-8665.
> The length of compact queue grows too big when the compacting is slow
> ---------------------------------------------------------------------
>
> Key: HBASE-26987
> URL: https://issues.apache.org/jira/browse/HBASE-26987
> Project: HBase
> Issue Type: Improvement
> Reporter: Zheng Wang
> Assignee: Zheng Wang
> Priority: Major
> Attachments: image-2022-04-29-10-26-09-351.png,
> image-2022-04-29-10-26-18-323.png, image-2022-04-29-10-26-24-087.png
>
>
> For some system compaction, we set the selectNow to false, so the file
> selecting will not be done until the compaction running, it brings side
> effect, if another compacting is slow, we may put lots of compaction to
> queue, because the filesCompacting of Hstore is empty in the meantime.
> An example shows at attachments, there are 154 regions and about 2000 hfiles,
> but the length of compact queue grows to 1391, it cause confusion and may
> trigger unexpected alarm.
> My approach is limit the compaction queue count, by compute the
> filesNotCompating and hbase.hstore.compaction.max.
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