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https://issues.apache.org/jira/browse/ZOOKEEPER-3473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Enrico Olivelli resolved ZOOKEEPER-3473.
----------------------------------------
Resolution: Fixed
Issue resolved by pull request 1027
[https://github.com/apache/zookeeper/pull/1027]
> Improving successful TLS handshake throughput with concurrent control
> ---------------------------------------------------------------------
>
> Key: ZOOKEEPER-3473
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3473
> Project: ZooKeeper
> Issue Type: Improvement
> Components: server
> Reporter: Fangmin Lv
> Assignee: Fangmin Lv
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.6.0
>
> Time Spent: 4h 20m
> Remaining Estimate: 0h
>
> When there are lots of clients trying to re-establish sessions, there might
> be lots of half finished handshake timed out, and those failed ones keep
> reconnecting to another server and restarting the handshake from beginning
> again, which caused herd effect.
>
> And the number of total ZK sessions could be supported within session timeout
> are impacted a lot after enabling TLS.
>
> To improve the throughput, we added the TLS concurrent control to reduce the
> herd effect, and from out benchmark this doubled the sessions we could
> support within session timeout.
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