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https://issues.apache.org/jira/browse/ZOOKEEPER-3110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Han resolved ZOOKEEPER-3110.
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Resolution: Fixed
> Improve the closeSession throughput in PrepRequestProcessor
> -----------------------------------------------------------
>
> Key: ZOOKEEPER-3110
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3110
> Project: ZooKeeper
> Issue Type: Improvement
> Components: quorum
> Reporter: Fangmin Lv
> Assignee: Fangmin Lv
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.6.0, 3.5.5
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> On leader every expired global session will add 3 lines of logs, which is
> pretty heavy and if the log file is more than a few GB, the log for the
> closeSession in PrepRequestProcessor will slow down the whole ensemble's
> throughput.
> From some use case, we found the prep request processor will be a bottleneck
> when there are constantly high number of expired session or closing session
> explicitly.
> This JIra is going to remove one of the useless log when prepare close
> session txns, which should give us higher throughput during processing large
> number of expire sessions.
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