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https://issues.apache.org/jira/browse/HBASE-9144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13732224#comment-13732224
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Lars Hofhansl commented on HBASE-9144:
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And leases rarely actually expire, so the cost is in adding/removing them.
The only concern then is when some client forgets to close scanners, although I
think we'd have other problems then.
> Leases class has contention that's not needed
> ---------------------------------------------
>
> Key: HBASE-9144
> URL: https://issues.apache.org/jira/browse/HBASE-9144
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.95.1
> Reporter: Elliott Clark
> Assignee: Elliott Clark
> Priority: Critical
> Fix For: 0.95.2
>
> Attachments: HBASE-9144-0.patch, Sheet1.pdf
>
>
> The Leases class has lots of thread contention. These locks are there to
> ensure that all timeouts are met exactly. This isn't needed in HBase.
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