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https://issues.apache.org/jira/browse/QPID-3042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajith Attapattu resolved QPID-3042.
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Resolution: Fixed
Fix Version/s: (was: Future)
0.10
Tested as part of QPID-2994
There is a test harness under the testkit module to test transactions during
failover which should adequately cover this issue.
> Session.attach could be sent before the connection is open.
> -----------------------------------------------------------
>
> Key: QPID-3042
> URL: https://issues.apache.org/jira/browse/QPID-3042
> Project: Qpid
> Issue Type: Bug
> Components: Java Client
> Affects Versions: 0.6, 0.7, 0.8
> Reporter: Rajith Attapattu
> Assignee: Rajith Attapattu
> Fix For: 0.10
>
>
> This bug was discovered while investigating QPID-2994
> This bug also caused QPID-3033
> There exist a race condition where an application could create a new session
> (recreating due to an exception or a completely new session in the midst of
> failover) before the connection is open.
> This results in session attach being sent before the connection negotiation
> is completed. All though the connect method and the createSession method in
> Connection.java contends for the same lock, the connect method which acquires
> it early, will releases the lock when it waits (until the connection achieves
> OPEN state) and the createSession method waiting on the lock will get it and
> continue.
> Usually this only becomes an issue during failover, as during the initial
> connection creation, the application thread that creates the connection will
> wait until the connect method returns before it creates a session.
> However If an application tries to create a connection in one thread and
> several other threads try to create sessions from that connection, and if
> those threads don't coordinate properly to check if the connection is opened,
> then this same race condition is present.
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