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https://issues.apache.org/jira/browse/HBASE-9144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13732228#comment-13732228
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Elliott Clark commented on HBASE-9144:
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Yeah that's what I saw when benchmarking on 0.95. (Scanner Pre-fetching was
running on lots of threads and not closing scanners so this was a big cost.)
Though now that scanner pre-fetching was backed out this is a little less
critical and I might actually only put it in trunk. Recent benchmark runs
haven't shown Leases.addLease nearly as high in cost since they are less
contended.
> 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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