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From "Rob Godfrey (JIRA)" <qpid-...@incubator.apache.org>
Subject [jira] Created: (QPID-2319) qpid-route hangs when connecting to the Java Broker
Date Mon, 04 Jan 2010 18:39:54 GMT
qpid-route hangs when connecting to the Java Broker
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                 Key: QPID-2319
                 URL: https://issues.apache.org/jira/browse/QPID-2319
             Project: Qpid
          Issue Type: Bug
          Components: python tools
            Reporter: Rob Godfrey


When working on the QMF implementation in the Java Broker I found that the Python tools which
use the qmf.console python API hung in the _waitForStable function of the Broker class

Investigating showed that although the count of outstandingRequests did drop to zero (the
condition the function is waiting for) it was not being alerted to this fact.

Adding debugging information into the code I could see that on entering _waitForStable the
count of outstanding requests was 1...
After entering the wait() the count droppped to zero through a call to _decOustanding ...
then increased again all the way up to through calls to incOutstanding 26... then again dropped
all the way to 0.

Looking at the code for _decOutstanding it's clear that the wait should be notified that the
count has dropped to zero, as long as the syncInFlight variable is true.

If this check is commented out (i.e. decOustanding calls notify even if syncInFlight is false)
then the tools do not hang

the conclusion would seem to be that something is setting syncInFlight to false causing the
_waitForStable function to not receive notifications that it can stop waiting...

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