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https://issues.apache.org/jira/browse/TC-197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeff Elsloo updated TC-197:
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Attachment: Screen Shot 2017-03-15 at 2.12.58 PM.png
Chart showing growth of threads, memory and connections.
> File descriptor leak caused by NIO protocol connector
> -----------------------------------------------------
>
> Key: TC-197
> URL: https://issues.apache.org/jira/browse/TC-197
> Project: Traffic Control
> Issue Type: Bug
> Components: Traffic Router
> Affects Versions: 2.1.0
> Reporter: Jeff Elsloo
> Attachments: Screen Shot 2017-03-15 at 2.12.58 PM.png
>
>
> The new default configuration for Traffic Router and Tomcat is to use the
> {{Http11NioProtocol}} adapter over the previous {{Http11Protocol}} adapter.
> This is accomplished via the {{LanguidNioProtocol}} connectors specified in
> Tomcat's {{server.xml}}.
> We observed a file descriptor leak with connections, but have not dug into
> the cause. We observed roughly 30-40k connections in {{CLOSE_WAIT}} which
> caused the machine to exhaust its file descriptors based upon configured
> limits. We also observed a similar growth curve on total threads, so
> something is not behaving and being cleaned up appropriately.
> The cause could range from a bug in the {{Http11NioProtocol}} connector due
> to the ancient version of Tomcat we're using, tuning within the connector
> itself (max threads, intervals, etc), tuning within the JVM (memory, GC,
> etc), or at the OS level (kernel params around TCP connections, etc).
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