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Posted to dev@qpid.apache.org by "Keith Wall (JIRA)" <ji...@apache.org> on 2016/01/13 15:31:40 UTC
[jira] [Updated] (QPID-6996) Can't make a node master twice (during
a single Broker lifetime)
[ https://issues.apache.org/jira/browse/QPID-6996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Keith Wall updated QPID-6996:
-----------------------------
Summary: Can't make a node master twice (during a single Broker lifetime) (was: Can't make a node master twice )
> Can't make a node master twice (during a single Broker lifetime)
> ----------------------------------------------------------------
>
> Key: QPID-6996
> URL: https://issues.apache.org/jira/browse/QPID-6996
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.30, 0.32, qpid-java-6.0
> Reporter: Keith Wall
> Priority: Minor
>
> The Java Broker's BDB HA implementation permits the mastership to be transferred around the group. To initiate this change, a user mutates the model attribute "role" on object {{BDBHAVHN}} or {{BDBHARRN}} to have the value {{MASTER}} through a management interface.
> If I make this change once, the change is effective. If later the mastership moves again (as a result of a failure and subsequent election or a transfer master elsewhere in the group), the attempt to move the mastership back to this node is ignored (defect).
> The issue is that ACO#changeAttributes blocks the subsequent change because it does not know that attribute's value is anything other than {{MASTER}}. This is because BDBHAVHN#setRole (happens asynchronously as the mastership changes) updates only the CO view of the attribute (#_role), leaving ACO#_attributes.get(ROLE) with a stale value {{MASTER}}. The Broker containing the node needs to be bounce to correct the state problem.
> The main use-case for transfer master is to restore the master to its business as usual position following a device failure. This use-case is not affected by this defect.
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