[jboss-jira] [JBoss JIRA] Commented: (JBAS-4455) LoadBalancePolicy that tries to pin all requests associated with a tx to one server

LoadBalancePolicy that tries to pin all requests associated with a tx to one server ----------------------------------------------------------------------------------- Key: JBAS-4455 URL: http://jira.jboss.com/jira/browse/JBAS-4455 Project: JBoss Application Server Issue Type: Feature Request Security Level: Public(Everyone can see) Components: Clustering Reporter: Brian Stansberry Assigned To: Galder Zamarreno Priority: Minor Fix For: JBossAS-5.0.0.Beta3 The HA proxies don't allow failover once a tx has reached a server. This can lead to this kind of situation: EJB A deployed on nodes 1 and 2. EJB B deployed on nodes 1 and 2. 1) Start tx, invoke on A.1. 2) Lookup B. 3) Invoke on B. LB policy picks B.2 4) Node 2 is dead for some reason so call fails. 5) Can't fail over because tx context won't allow a failover after a call has reached a server. But, B.1 is fine and is running on the only node the tx has invoked on. :( Approach to improving this. This is based on JRMPInovkerProxyHA methods, but the idea is generic: In invocationHasReachedAServer, instead of storing null as the value, you store the target (key is the tx). In invoke, if there's a tx, you add that target (if there is one) to the invocation as transient metadata The LB policy gets passed the invocation as an arg when it chooses a target (this is already in the API) LB policy checks for the metadata. If there, and that target is in its target list, return that target