We found this in Jira: https://issues.apache.org/struts/browse/WW-2474 The submitter reports a similar issue with struts2-core-2.0.11.jar, but associates it with the use of the struts2 form tag. I'm seeing it with a freemarker template that uses this tag. It happens to be our login page.
Our load balancer was hitting this page every 10 seconds to decide that the node was up. Interestingly, we see a wild variation in the file handle count among all the nodes. We've addressed some of the immediate pain by upping the file handle limit using ulimit and by changing the target of our heartbeat request to something else. That said, this is clearly some kind of file handle leak. I'll report more if I discover it. ----- Original Message ---- From: Dave Newton <[EMAIL PROTECTED]> To: Struts Developers List <dev@struts.apache.org> Sent: Friday, February 29, 2008 2:06:59 PM Subject: Re: Severe production issue: struts2-core-2.0.9.jar has hundres of file handles FWIW (not much), I can't duplicate this with S2.0.11 under Mac OS X; I may have a report from both Windows and Linux boxen in a little bit. Dave --- Bryan Taylor <[EMAIL PROTECTED]> wrote: > We're troubleshooting a severe problem in our production system. We get > errors like this in tomcat: > SEVERE: Socket accept failed > org.apache.tomcat.jni.Error: Too many open files > > We're on linux and run lsof to show the files tomcat has open, which shows > hundreds (763 in one example) of distinct open files for > struts2-core-2.0.9.jar . The large number of these causes us to hit the > limit on the number of open files (1024 by default). > > In a development setting, I run the following script to display open file > handles to this jar every second: > [root]# while true; do lsof -p $TOMCAT_PID | grep struts2-core-2.0.9.jar | > wc -l; sleep 1; done > > When I go to our login page (a freemarker template served by a struts > action) if I hit refresh on the page as quickly as I can, I see the numbers > start at 2 or 3 and then go up in jumps of 20 at a time (eg 23, 43, 63, > 83). After a while, say 30 seconds, the number will drop again, perhaps due > to garbage collection. It appears that under our production load, the > increases are beating the decreases until we hit the open file limit. > > We have attempted to duplicate this with the struts showcase sample app. > One user by simply hitting refresh a lot can make the file handle count go > into the 30's. > > Any ideas on what could be happening? Any help is greatly appreciate -- > this is causing us big problems. > > > > > > > > ____________________________________________________________________________________ > Looking for last minute shopping deals? > Find them fast with Yahoo! Search. > http://tools.search.yahoo.com/newsearch/category.php?category=shopping > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] ____________________________________________________________________________________ Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
