Hello, I'm using httpd 2.2.22 with mod_jk 1.2.32 and 2 load balanced tomcat workers (TC 6.0.35). I have a question about recovery in case when active worker becomes abruptly inactive.
Here's my test scenario: 1. Web service client sends SOAP request to apache server. This client sends requests in 2 flavors, either it is a generic SOAP call (A case) or a soap request with some files attached with MTOM (B case). Web service is capable of handling both types of requests. 2. Once the processing starts, I kill this tomcat with "kill -9". The results are: A - when tomcat1 is killed, the request is automatically transmitted to tomcat2. Client receives correct results. This is OK. B - when tomcat1 is killed, the request is not transmitted to tomcat2. Client receives 502 error: bad gateway instead. The configuration is unchanged (no recovery options set). The only difference is the request which is obviously larger in B case (some text files attached). These lines I found particularly mysterious: (tomcat1) sending request to tomcat failed (recoverable) (tomcat1) sending request to tomcat failed (unrecoverable), (attempt=1) Why is one request failure considered to be recoverable and the other is not ? Best regards, Kate Logs for A: [Fri Apr 27 12:15:11 2012] [1757184:1] [info] init_jk::mod_jk.c (3252): mod_jk/1.2.32 () initialized [Fri Apr 27 12:15:29 2012] [1331310:1] [info] ajp_connection_tcp_get_message::jk_ajp_common.c (1266): (tomcat1) can't receive the response header message fro [Fri Apr 27 12:15:29 2012] [1331310:1] [error] ajp_get_reply::jk_ajp_common.c (2118): (tomcat1) Tomcat is down or refused connection. No response has been se [Fri Apr 27 12:15:29 2012] [1331310:1] [info] ajp_service::jk_ajp_common.c (2607): (tomcat1) sending request to tomcat failed (recoverable), (attempt=1) [Fri Apr 27 12:15:29 2012] [1331310:1] [info] jk_open_socket::jk_connect.c (626): connect to x.x.x.15:8191 failed (errno=79) [Fri Apr 27 12:15:29 2012] [1331310:1] [info] ajp_connect_to_endpoint::jk_ajp_common.c (1008): Failed opening socket to (x.x.x.15:8191) (errno=79) [Fri Apr 27 12:15:29 2012] [1331310:1] [error] ajp_send_request::jk_ajp_common.c (1630): (tomcat1) connecting to backend failed. Tomcat is probably not start [Fri Apr 27 12:15:29 2012] [1331310:1] [info] ajp_service::jk_ajp_common.c (2607): (tomcat1) sending request to tomcat failed (recoverable), because of error [Fri Apr 27 12:15:29 2012] [1331310:1] [error] ajp_service::jk_ajp_common.c (2626): (tomcat1) connecting to tomcat failed. [Fri Apr 27 12:15:29 2012] [1331310:1] [info] service::jk_lb_worker.c (1400): service failed, worker tomcat1 is in error state [Fri Apr 27 12:15:42 2012] Req: tomcat1 15.197145 s POST 1553 200 Logs for B: [Fri Apr 27 12:16:23 2012] [1757184:1] [info] init_jk::mod_jk.c (3252): mod_jk/1.2.32 () initialized [Fri Apr 27 12:19:08 2012] [1376450:1] [info] ajp_connection_tcp_get_message::jk_ajp_common.c (1266): (tomcat1) can't receive the response header message fro [Fri Apr 27 12:19:08 2012] [1376450:1] [error] ajp_get_reply::jk_ajp_common.c (2118): (tomcat1) Tomcat is down or refused connection. No response has been se [Fri Apr 27 12:19:08 2012] [1376450:1] [error] ajp_service::jk_ajp_common.c (2600): (tomcat1) sending request to tomcat failed (unrecoverable), (attempt=1) [Fri Apr 27 12:19:08 2012] [1376450:1] [info] service::jk_lb_worker.c (1400): service failed, worker tomcat1 is in error state [Fri Apr 27 12:19:08 2012] [1376450:1] [error] service::jk_lb_worker.c (1425): unrecoverable error 502, request failed. Tomcat failed in the middle of reques [Fri Apr 27 12:19:08 2012] [1376450:1] [error] service::jk_lb_worker.c (1485): All tomcat instances failed, no more workers left [Fri Apr 27 12:19:08 2012] Req: tomcat1 2.968299 s POST 0 200 [Fri Apr 27 12:19:08 2012] [1376450:1] [info] jk_handler::mod_jk.c (2678): Service error=0 for worker=loadbalancer
