-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Rob,
On 10/7/2010 12:59 PM, Rob G wrote: > Recently migrated a production site (mixture of Servlets and JSPs) > from Oracle Application Server to Apache/Tomcat. Since then we have > seen numerous HTTP Error 503 - Service unavailable errors at peak > times when site is under load. mod_jk.log has the following error > message(s): > > [2184:1952] [error] jk_lb_worker.c (1473): All tomcat instances > failed, no more workers left Just to reinforce a comment by Andre, I think you might want to compare the request processor counts you have for Tomcat versus mod_jk: the default maxThreads for a Tomcat <Connector> is 200, while your MaxClients settings might be different on your Apache httpd configuration. If you have httpd.MaxClients=250 and connector.maxThreads=200 then you have a deficit of 50 who will get 503 errors if they try to access your webapp during peak load. > Apache: 2.2.16 I believe that only the Worker MPM is available on Microsoft Windows. Have you explicitly configured an MPM? > worker.worker1.cachesize=10 You might want to read the documentation for worker.cachesize in http://tomcat.apache.org/connectors-doc/reference/workers.html Note that it's deprecated and you should use connection_pool_size instead. Since you're using Apache 2.x, mod_jk should be able to auto-configure this value for you. - From my reading, you may be limiting yourself to 10 simultaneous connections from Apache httpd to Tomcat, and others will get a 503. Rainer or Mladen will have to comment to clarify: I am certainly no expert in mod_jk configurations. Hope that helps, - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkyuRwUACgkQ9CaO5/Lv0PC3nACePwYgc2w4td8jSdRCM5rp9IB9 PB4AoKj4cR9F+FhsR20W4vIvcWkRevyL =nuW/ -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
