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https://issues.apache.org/jira/browse/QPID-6201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14190366#comment-14190366
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ASF subversion and git services commented on QPID-6201:
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Commit 1635547 from [~k-wall] in branch 'qpid/trunk'
[ https://svn.apache.org/r1635547 ]
QPID-6201: [Java Broker] HA use separate single thread executor to deliver JE
state change events
> 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
> Assignee: Keith Wall
> Labels: HA
> 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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