Zeke schrieb: > Hi, all: > I configure a Apache with mod_jk as HTTP load balancer for a JBoss > cluster. My cluster provide some web services. Of course, the URL in the web > serice call by client is the URL of the load balancer's. If for some reason, > the web service on a node is unavailable, client call on it will get a 500 > error response which should be handled by mod_jk using fail_on_status > directive. I tried it but found that the fail over seems not work. For > example, I have two nodes in a cluster, web serivce on node 1 is available > but web service on node 2 is not available. I send 10 call through load > balancer, but found that 9 calls succeeded, but one still get exception. It > seems that after the first call is dispatched to node 2, node 2 will return > 500 error and inform load balancer to mark it as in an error state. Then the > next calls will not be dispatched to node 2 again. It is good. But the first > call itself does not fail over to node 1. So only 9 call succeed. > Do I forget some other configuration to make the first call fail over? My > workers.properties is like below. Any suggestion from you will be very > appreciated!
I guess the calls are POST requests with a not very small body. We can't repost a big POST, because we don't buffer all the body. The whole thing is a streaming architecture, so we can replay one body packet if we detect a communication problem early, but if we sent a huge body and only after processing we get a 500 from the backend, we don't have the full body around to repost to another failover backend. If the backend doesn't accept the request, failover should work. Regards, Rainer --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
