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https://issues.apache.org/jira/browse/HBASE-27547?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Duo Zhang resolved HBASE-27547.
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Fix Version/s: 2.6.0
3.0.0-alpha-4
2.4.17
2.5.4
Hadoop Flags: Reviewed
Resolution: Fixed
Pushed to branch-2.4+.
Thanks [~Eungsop Yoo] for contributing!
> Close store file readers after region warmup
> ---------------------------------------------
>
> Key: HBASE-27547
> URL: https://issues.apache.org/jira/browse/HBASE-27547
> Project: HBase
> Issue Type: Bug
> Reporter: Eungsop Yoo
> Assignee: Eungsop Yoo
> Priority: Major
> Fix For: 2.6.0, 3.0.0-alpha-4, 2.4.17, 2.5.4
>
>
> 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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