David Kumar wrote:
Hey,
my name is David an I'm working for a electronic consumer company in Germany we
are selling and producing TV's, receiver, satellite dishes etc..
We got some serious trouble with our tomcats. Basically we using two 7.0.12
tomcats on a single Debian 6.0. One is running on port 7090 and the other on
9080. Time after time both tomcats are crashing. I found too many open files in
tomcatlogfiles.
Both Servers are running with one user (TOMCAT).
After changing max open files for that particular user I was able to get more
than 1024 open files. Currently I'm checking log files every few minutes. With
lsof|grep tomcat|wc -l I'm counting the open files by user. Usually there are
around 600-700 open files. But sometimes the count grows and we have more than
1200 open files.
When ever the server does have so many open files I checked: lsof -u tomcat an
figured out there are many connection waiting to be closed. The connections are
looking like this:
java 22312 tomcat 153u IPv6 1508517 0t0 TCP
localhost:afs3-rmtsys->localhost:50127 (CLOSE_WAIT)
I googled a bit for afs3-rmtsys and figured out that the protocol seems to be a
remote cache manager. But I couldn't find any more information.
Does anyone of you know what my problem might be?
Hi.
I did some googling too, and got this explanation of "afs" :
http://www.debian-administration.org/article/610/OpenAFS_installation_on_Debian#intro-afs
So apparently, this is some kind of network filesystem.
Can you tell us where exactly your Tomcat is installed, in terms of the files ?
What you are explaining above sounds to me as if many files used are on some shared
network location, and it may just be that it is the heavy usage of such files (and the
opening/closing of corresponding TCP connections to access these files), that could be the
cause of your problem.
A "CLOSE_WAIT" state in itself is normal in the TCP protocol. It happens (temporarily)
when one side of the connection closes it, and waits for the other side to acknowledge the
close. (Or something like that, I would have to check really).
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
For additional commands, e-mail: users-h...@tomcat.apache.org
