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https://issues.apache.org/jira/browse/ZOOKEEPER-974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16767626#comment-16767626
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Josh Elser commented on ZOOKEEPER-974:
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Thanks for the commit, Andor!
> Configurable listen socket backlog for the client port
> ------------------------------------------------------
>
> Key: ZOOKEEPER-974
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-974
> Project: ZooKeeper
> Issue Type: Improvement
> Components: server
> Affects Versions: 3.3.2
> Reporter: Hoonmin Kim
> Assignee: Josh Elser
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.6.0
>
> Attachments: ZOOKEEPER-974.001.master.patch, ZOOKEEPER-974.001.patch,
> ZOOKEEPER-974.patch
>
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> We're running ZooKeeper ensemble(3-node configuration) for production use for
> months.
> Days ago, we suffered temporary network? problems that caused many
> reconnections(about 300) of ephemeral nodes in one ZooKeeper server.
> The almost all clients successfully reconnected to the other ZooKeeper
> servers,
> but one client failed to reconnect in time and got a session expired message
> from the server.
> (The problem is that our clients died when they got SessionExpired message.)
> There were many listenQ overflows/drops and out resets in a minute just
> before the problem situation.
> ---
> So we patched ZooKeeper to increase the backlog size for the client port
> socket to avoid unhappy cases like this.
> As ZooKeeper uses default backlog size(50) to bind(), we added
> "clientPortBacklog" option.
> Though the default backlog should be good for common environment,
> we believe that configuring the size is also meaningful.
> [Note]
> On linux, below parameter :
> net.core.somaxconn
> needs to be larger than above "clientPortBacklog" to correctly configure
> listen socket backlog
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