[jira] [Created] (QPID-6201) BDB state change events must be delivered sequential to the virtualhostnode

["Keith Wall (JIRA)" <ji...@apache.org>]

Keith Wall created QPID-6201:
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             Summary: BDB state change events must be delivered sequential to the virtualhostnode
                 Key: QPID-6201
                 URL: https://issues.apache.org/jira/browse/QPID-6201
             Project: Qpid
          Issue Type: Bug
          Components: Java Broker
    Affects Versions: 0.30
            Reporter: Keith Wall
             Fix For: 0.31


The ReplicatedEnvironmentFacade uses a thread pool executor to deliver JE state change notifications up to the BDBHAVHN.  JE requires this - it stipulates you should do minimal work in these callbacks.  These events (transitions to replica, master etc) need to be delivered sequentially to the node in order for the BDBHAVHN to behave correctly.

Unfortunately a coding error has accidentally assigned this to a thread pool with multiple threads, meaning this may not be the case.

This has been seen to cause a group in a state where a VHN was in the MASTER role, but its underlying virtual host remained UNAVAILABLE.




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