monitoring open connections to tomcat 2006-11-14 - By Rizwan Merchant
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Hi,
We are running a couple of webapps on the same tomcat instance. We are
using apache web server along with the mod_jk connector to forward
requests to tomcat.
A couple of weeks ago we had a situation where the tomcat process ran
out of file connections (we got an error of the sort "too many open
files"). I dont have the exact error on me, but as per our developer, as
a security measure linux restricts the number of connections (files,
sockets, etc) a process can use and the default is 1024.
The number of open connections can be viewed using the command
lsof -p <pid>
We had to restart the server at that point, and have been monitoring
this ever since. I now see that the number is creeping up again, and I
have noticed many entries of the following type
jsvc 26517 tomcat 90u sock 0,5 6921708 can't
identify protocol
Can anyone identify what this "can't identify protocol" means? There are
quite a few of them and I am wondering if this is causing the problem
when the server is running for a while.
Any help would be appreciated.
Thanks,
-Riz.
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