Hi Jason, ‘Files’ in this context is really a file descriptor, which is any connectable resource in the system, including both files and sockets.
I do agree that it’s unlikely that Tomcat hogs 6.5 million FDs, but I’m not convinced that is the real limit either. You could try: ulimit -n To get the max for open file descriptors in the system. You can check max FDs for the Tomcat process by running: cat /proc/<pid-of-tomcat>/limits Which is usually around 1024. Also this <https://www.jayway.com/2012/02/11/how-to-really-fix-the-too-many-open-files-problem-for-tomcat-in-ubuntu/> might be useful. Lastly, if the limits are sane (which they probably are) and you are able to reproduce the issue you could try using this tool <http://file-leak-detector.kohsuke.org/> to pinpoint the problem. (Disclaimer: I have no experience with it). On Mon, Sep 5, 2016 at 11:22 PM, Jason Phillips <[email protected]> wrote: > Hi all, > > > > We have a system that tanked last night, reporting: > > > > 14-Aug-2016 19:13:57.440 SEVERE [http-nio-8080-Acceptor-0] > org.apache.tomcat.util.net.NioEndpoint$Acceptor.run Socket accept failed > > java.io.IOException: Too many open files > > at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method) > > at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java: > 422) > > at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java: > 250) > > at org.apache.tomcat.util.net.NioEndpoint$Acceptor.run( > NioEndpoint.java:687) > > at java.lang.Thread.run(Thread.java:745) > > > > Any ideas what the cause might be? The environment is Ubuntu 14.04, > Tomcat 8, Java 8. > > A cat /proc/sys/fs/file-max returns 6556412 – and that system was > physically restarted within the last week. I find it hard to believe that > the web server would have 6,5 million files open in such a short period of > time. > > War is 2.23 > > OS is Ubuntu 14.04 LTS > > Tomcat 8 > > Java 8 > > > > Kind Regards, > > *Jason Phillips* > > [image: hisp] > *Information Systems / Infrastructure* > > *Health Information Systems Program____________________________________* > > eMail: [email protected] > Tel/Fax: +27 21 712 0170 > Cell: +27 72 973 7250 > Skype: jason.n.phillips > > This message and any attachments are subject to a disclaimer published at > http://www.hisp.org/policies.html#comms_disclaimer. Please read the > disclaimer before opening any attachment or taking any other action in > terms of this electronic transmission. If you cannot access the > disclaimer, kindly send an email to [email protected] and a copy will > be provided to you. By replying to this e-mail or opening any attachment > you agree to be bound by the provisions of the disclaimer. > > > > *This message and any attachments are subject to a disclaimer published at > http://www.hisp.org/policies.html#comms_disclaimer > <http://www.hisp.org/policies.html#comms_disclaimer>. Please read the > disclaimer before opening any attachment or taking any other action in > terms of this electronic transmission. If you cannot access the > disclaimer, kindly send an email to [email protected] > <[email protected]> and a copy will be provided to you. By replying to > this e-mail or opening any attachment you agree to be bound by the > provisions of the disclaimer.* > > _______________________________________________ > Mailing list: https://launchpad.net/~dhis2-users > Post to : [email protected] > Unsubscribe : https://launchpad.net/~dhis2-users > More help : https://help.launchpad.net/ListHelp > > -- Halvdan Hoem Grelland Software developer, DHIS 2 University of Oslo http://www.dhis2.org <https://www.dhis2.org/>
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