Session.attach could be sent before the connection is open.
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Key: QPID-3042
URL: https://issues.apache.org/jira/browse/QPID-3042
Project: Qpid
Issue Type: Bug
Components: Java Client
Affects Versions: 0.8, 0.7, 0.6
Reporter: Rajith Attapattu
Assignee: Rajith Attapattu
Fix For: Future
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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