I've been investigating why some of my tomcat servers run out of file handles when ther'es a problem with the database and connections start backing up. I've discovered some things that have me scratching my head, and I'm hoping someone can help me come up with at least an explanation, maybe even a solution.
First, I've got 4 Apache 2.0.46 on RedHat ES 3 in the DMZ. Their MaxClients are set to 200, and they are using mod_jk2 2.0.4 that I compiled from source.. I've got 8 tomcat 5.0.25 servers on ES3 (IBM 1.4.2 JDK) on the internal network with their AJP connectors configured like this: <Connector port="10818" maxThreads="800" minSpareThreads="25" maxSpareThreads="75" enableLookups="false" redirectPort="8443" debug="0" acceptCount= "100" protocol="AJP/1.3" /> Right now, everything's running fine, and if I do this on a web server: lsof | grep -c 10\.168\.2\.33 - (where 10.168.2.33 is a tomcat server) I get 27 on one particular web server. However, if I then on the 10.168.2.33 tomcat server do this: lsof | grep -c 207\.14\.x\.x where 207.14.x.x is the web server I used previously, I get 5771. Without the -c on the grep, there are LOTS of lines like this coming from lsof: java 15371 tcat 232u IPv4 185883929 TCP xsappe:10818->207.14.x.x:37082 (ESTABLISHED) Just with different port numbers on the web server side. Is lsof not telling me what I think it is, or does tomcat really have nearly 6000 file handles sitting around while the web server thinks it only has 27 connections to tomcat? That seems like a problem to me, but I'm not sure my methodology is 100% correct. The reason I'm looking into this, is in the past when we've had database problems and reqeusts get backed up in the tomcat servers, they appear to run out of file handles. They can't get connections to the db, can't write to files, etc. I did an lsof right after that had happened and then gone away (no re-start of tomcat). The output of that lsof re-directed to a file has 693495 lines, 437382 of which match 10818 according to grep. I'm trying to figure out if and why tomcat is using all these file handles. Or if I'm just mis-interpreting lsof. Any suggestions would be greatly appreciated. Thanks, Barry Roberts --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]