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Re: [jetty-users] Help trying to investigate a file descriptor leak 
Hi Jan,

Le Tue, 20 Feb 2018 16:25:04 +1100,
Jan Bartel <janb@xxxxxxxxxxx> a écrit :

> We haven't had any reports of file descriptor leaks that I'm aware of.

Thank you very much for spending time to answer.
> 
> How are you serving static content with Jetty - are you using a
> ResourceHandler, or are you using the DefaultServlet, or something
> else?

I have no kind of idea. I'm the system administrator, so I can only
provide informations about how I've installed jetty and deployed the
application.

I'm using the shipped init script, that reads from /etc/default/jetty.
In that file I have:

JETTY_HOME=/srv/apprun/jetty/current
JETTY_BASE=/srv/appdata/jetty/base-xxx
TMPDIR=/srv/appdata/jetty/temp-xxx
JAVA_OPTIONS='-Xmx4096m'

The webapp is deployed in base-xxx/webapps/root

Inside WEB-INF/ there, there is a web.xml which doesn't contain any
reference to the classes ResourceHandler,DefaultServlet you mention.

(I am providing web.xml as attachement)

Inside JETTY_BASE I have a classic start.ini file with the following
content:

$ cat start.ini | sed -e '/^#/ d' -e '/^$/ d'
--module=http-forwarded
--module=console-capture
--module=http
jetty.http.port=8100
--module=deploy
jetty.deploy.extractWars=false


About JETTY_HOME, jetty runtime is unpacked here, untouched.

> 
> If you are using the DefaultServlet, check how it is configured - do
> you have caching enabled? Look for the settings of these init-params:
> 
> - resourceCache
> - maxCacheSize
> - maxCachedFileSize
> - maxCachedFiles
> - useFileMappedBuffer
> 
> You can turn debug on to see more info on the handling of static
> files - add -Dorg.eclipse.jetty.servlet.DefaultServlet.LEVEL=DEBUG
> and -Dorg.eclipse.jetty.server.ResourceService.LEVEL=DEBUG to the
> command line if you're using jetty's default logging, or otherwise
> configure whatever logging system you're using to output highest
> level for those classes.

I am supposed to add the above -Dxx calls in /etc/default/jetty ? in
JAVA_OPTIONS variable ?

> 
> You can also specify jetty.dump.start=true at the very end of the
> jetty command line. That will spit out most of the configuration of
> your jetty server to the log just after it starts - might reveal
> something useful.
> 

I'm adding this to start.ini I suppose. Thanks.

> regards

Regards,

> Jan
> 
> 
> 
> 
> On 14 February 2018 at 22:17, <mh@xxxxxxx> wrote:
> 
> > Hello everybody.
> >
> > I need a guess if the issue below could come from Jetty.
> > We run a webapp (XWiki) at https://www.ow2.org
> >
> > The application is reached through Apache as a reverse proxy.
> > Jetty is 9.4.6.v20170531 running on Debian (9.3)
> > JVM is 8u151-b12-1~deb9u1
> >
> > The issue I observe from the xwiki perspective is detailed at:
> >
> > https://jira.xwiki.org/browse/XWIKI-15009
> >
> > As far as I understand, the specific content of the webapp at
> > https://www.ow2.org/resources/ is statically served by Jetty and
> > opened by XWiki through it. (I don't know how).
> >
> > The issue we observe is as time goes on, many files - not all of
> > them - in the folder 'resources' above like
> > https://www.ow2.org/resources/js/xwiki/meta.js are opened more than
> > 2 times by the java process and that number keeps increasing. We
> > observe that by running:
> >
> > lsof -p 21948 | egrep '(REG|DIR)' | awk '{print $9'} | sort | uniq
> > -c |sort -n
> >
> > XWiki support team says they haven't got any report of such a
> > behavior recently.
> >
> > By the way we're also using http://www.tuckey.org/urlrewrite/ which
> > is installed as a JAR in the webapp and called via web.xml. The
> > configuration of the rewrite filter is as stated in
> > http://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/ShortURLs/#
> > HUrlRewriteFilter
> >
> > Unfortunately I can't disable the rewrite filter for testing purpose
> > right now as it would break URL schemes compatibility with URLs
> > already spread over the internet.
> >
> > NB : The leak concerns *only* files in '/resources' which are
> > expected to be server statically (by Jetty in the current case).
> >
> > Regards,
> >
> > _______________________________________________
> > jetty-users mailing list
> > jetty-users@xxxxxxxxxxx
> > To change your delivery options, retrieve your password, or
> > unsubscribe from this list, visit
> > https://dev.eclipse.org/mailman/listinfo/jetty-users
> >  
> 
> 
> 



-- 
Martin

Attachment: web.xml
Description: XML document

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