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https://issues.apache.org/jira/browse/HBASE-27547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17681680#comment-17681680
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Tak-Lon (Stephen) Wu commented on HBASE-27547:
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added Addendum
[#2167e8e3ef02141646f3c5fa4fd46e8314e6a077|https://github.com/apache/hbase/commit/2167e8e3ef02141646f3c5fa4fd46e8314e6a077]
to branch-2.5
> Close store file readers after region warmup
> ---------------------------------------------
>
> Key: HBASE-27547
> URL: https://issues.apache.org/jira/browse/HBASE-27547
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Reporter: Eungsop Yoo
> Assignee: Eungsop Yoo
> Priority: Major
> Fix For: 2.6.0, 3.0.0-alpha-4, 2.4.16, 2.5.3
>
>
> We recently upgraded one of our clusters from version 1.4.13 to 2.4.15. After
> that we noticed that the number of open FD was increased 10 times more than
> before, from 1.3k to 15k. Each RS has about 1000 regions.
>
> I thouht that it is OK if the number of open FD keeps steady. But the number
> was increased when regions were balanced. I found that there is a bug related
> to the region warmup process, which leaks opened FDs, and I fixed it. Please
> review the PR.
>
> But I still have a question about why HBase 2.4 opens much more than 1.4. I
> am trying to find the answer, but not yet. Is there any person who can answer
> the question?
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