[QPID-7588] [Python Client 0-8..0-91] The received message ocasionally might not be dispatched into the application queue in timely manner

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: qpid-python-1.35.0
• Fix Version/s: qpid-python-1.36.0
• Component/s: Python Test Suite
• Assignee: Keith Wall
• Reporter: Alex Rudyy
• Created: 14/Dec/16 09:29
• Updated: 02/Oct/19 19:21
• Resolved: 04/Jan/17 14:57

Description

The python test qpid_tests.broker_0_9.echo.EchoTests.test_largest_single_frame_message for 0.9 AMQP protocol fails occasionally with the following stack trace:

qpid_tests.broker_0_9.echo.EchoTests.test_largest_single_frame_message (from (TEST-python_pre1.0.xml))
Failing for the past 1 build (Since Failed#1256 )
Took 14 sec.
Stacktrace


Error during test:  Traceback (most recent call last):
    File "/home/jenkins/jenkins-slave/workspace/Qpid-Python-Java-Test/site-packages/bin/qpid-python-test", line 340, in run
      phase()
    File "/home/jenkins/jenkins-slave/workspace/Qpid-Python-Java-Test/site-packages/lib/python2.7/site-packages/qpid_tests/broker_0_9/echo.py", line 45, in test_largest_single_frame_message
      self.echo_message(body)
    File "/home/jenkins/jenkins-slave/workspace/Qpid-Python-Java-Test/site-packages/lib/python2.7/site-packages/qpid_tests/broker_0_9/echo.py", line 61, in echo_message
      msg = consumer.get(timeout=1)
    File "/home/jenkins/jenkins-slave/workspace/Qpid-Python-Java-Test/site-packages/lib/python2.7/site-packages/qpid/queue.py", line 51, in get
      result = BaseQueue.get(self, block, timeout)
    File "/usr/lib/python2.7/Queue.py", line 176, in get
      raise Empty
  Empty

The client and broker logs have records of the message being received by the client in timely manner (It took 3millisecond to deliver the message). However, the received message was not put into the client queue and test failed.

It is unclear at the moment whether it is an issue with threads or a bug in client code. More investigation is required.

The issue might cause sporadic timeouts in applications using 0.8...0.91 python API.