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https://issues.apache.org/jira/browse/QPID-6209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew MacBean resolved QPID-6209.
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Resolution: Fixed
Looks good to me.
> Ensure node discoverer returns a value for every node even if node is
> partitioned
> ---------------------------------------------------------------------------------
>
> Key: QPID-6209
> URL: https://issues.apache.org/jira/browse/QPID-6209
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.30
> Reporter: Keith Wall
> Assignee: Alex Rudyy
> Labels: HA
> Fix For: 0.31
>
>
> The BDB HA node discoverer is used by the BDBHAVHN to determine the state of
> the other nodes in the group. The information is presented on the UI so that
> the Operator has a complete picture of the group.
> There was an issue found during the HA acceptance test that deliberately
> forms a network partition around the a master node. It was seen that the
> state of the group when observed from the other nodes was incorrect: the
> group appeared to have two masters - both the newly elected master and the
> original master.
> The underlying issue was the monitoring itself. JE DbPing hangs indefinitely
> whilst trying to connect to the target node. If the packets are lost (as is
> the case during our test which uses iptables DROP), then it hangs
> indefinitely. This behaviour meant the the node discoverer
> (ReplicatedEnvironmentFacade.RemoteNodeStateLearner#discoverNodeStates)
> returned no map entry for the partitioned node and thus caused the stale
> value to linger on the UI.
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