[QPID-3237] Python broker tests hang in environments where the available file handles > 1024

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Auto Closed
• Component/s: Python Test Suite

Environment

As root, append to the /etc/security/limits.conf the following line to assign yourself the ability to open 64k file handles (substitute your login id):

kpvdr - nofile 65536

then log out/in as yourself.

• Assignee: Unassigned
• Reporter: Kim van der Riet
• Created: 29/Apr/11 15:56
• Updated: 14/Mar/18 20:27
• Resolved: 14/Mar/18 20:27

Description

When the environment is modified to allow the qpid user to open more than 1024 file handles, then the following python tests fail/hang. The underlying cause seems to be the use of the python call to select(), which uses the underlying unix ::select() call. However, it is a well-known limitation that the unix select() cannot handle more than 1024 file handles. Perhaps switching the tests to using epoll would solve this issue.

qpid.tests.messaging.endpoints.SetupTests.testOpenCloseResourceLeaks ................................................................................................. start
Exception in thread Thread-81:
Traceback (most recent call last):
File "/usr/lib64/python2.6/threading.py", line 532, in __bootstrap_inner
self.run()
File "/usr/lib64/python2.6/threading.py", line 484, in run
self._target(*self.args, **self._kwargs)
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/selector.py", line 119, in run
rd, wr, ex = select(self.reading, self.writing, (), timeout)
ValueError: filedescriptor out of range in select()

qpid.tests.messaging.endpoints.SetupTests.testOpenCloseResourceLeaks ................................................................................................. fail
Error during test:
Traceback (most recent call last):
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/commands/qpid-python-test", line 311, in run
phase()
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/tests/messaging/endpoints.py", line 86, in testOpenCloseResourceLeaks
conn = Connection.establish(self.broker, **self.connection_options())
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/messaging/endpoints.py", line 68, in establish
conn.open()
File "<string>", line 6, in open
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/messaging/endpoints.py", line 244, in open
self.attach()
File "<string>", line 6, in attach
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/messaging/endpoints.py", line 262, in attach
self._ewait(lambda: self._transport_connected and not self._unlinked())
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/messaging/endpoints.py", line 196, in _ewait
result = self._wait(lambda: self.error or predicate(), timeout)
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/messaging/endpoints.py", line 181, in _wait
return self._waiter.wait(predicate, timeout=timeout)
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/concurrency.py", line 57, in wait
self.condition.wait(3)
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/concurrency.py", line 96, in wait
sw.wait(timeout)
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/compat.py", line 53, in wait
ready, _, _ = select([self], [], [], timeout)
ValueError: filedescriptor out of range in select()
qpid.tests.messaging.endpoints.SetupTests.testOpenFailResourceLeaks .................................................................................................. fail
Error during test:
Traceback (most recent call last):
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/commands/qpid-python-test", line 311, in run
phase()
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/tests/messaging/endpoints.py", line 102, in testOpenFailResourceLeaks
conn._wait(lambda: False, timeout=0.001)
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/messaging/endpoints.py", line 181, in _wait
return self._waiter.wait(predicate, timeout=timeout)
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/concurrency.py", line 59, in wait
self.condition.wait(timeout - passed)
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/concurrency.py", line 96, in wait
sw.wait(timeout)
File "/home/kpvdr/mrg/qpid/cpp/src/tests/python/qpid/compat.py", line 53, in wait
ready, _, _ = select([self], [], [], timeout)
ValueError: filedescriptor out of range in select()
qpid.tests.messaging.endpoints.SetupTests.testOpenReconnectURLs ......................................................................................................<hang>