Broker crash when using auto delete queues in a cluster
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Key: QPID-3896
URL: https://issues.apache.org/jira/browse/QPID-3896
Project: Qpid
Issue Type: Bug
Components: C++ Clustering
Affects Versions: 0.17
Reporter: Ken Giusti
Assignee: Alan Conway
Fix For: 0.17
I can get the broker to crash with a simple configuration involving multiple
'auto delete' queues.
The following client pseudo code can cause the crash:
loc_sess = [ ];
# create couple of sessions
for i in range(in_loops):
queue_durability = False;
if (i % 2 == 1):
queue_durability = True;
# create new local session[s]
lsess = self.connection.session(loc_sess_name % i);
# delete the queue (if needed)
self.cleanup(in_queue=loc_q_name % i);
# declare auto-delete queue[s]
lsess.queue_declare(queue=loc_q_name % i,
auto_delete=True,
arguments={"qpid.auto_delete_timeout" : q_timeout},
durable=queue_durability);
# check that queue[s] is still available
result = lsess.queue_query(queue=loc_q_name % i);
self.assertEqual(loc_q_name % i, result.queue);
# bind queue to exchange amf.fanout
lsess.exchange_bind(exchange=e_name,
queue=loc_q_name % i,
binding_key=f_name);
# append the session to list
loc_sess.append(lsess);
# send messages to the queues via amq.fanout
dp = sess.delivery_properties(routing_key=f_name);
msg_cnt = random.randint(*MSG_CNT_RR);
print "setup: in_loops:%d, msg_cnt:%d" % (in_loops, msg_cnt);
for j in range(msg_cnt):
sess.message_transfer(destination=e_name,
message=qpid.datatypes.Message(dp, msg_layout % j));
# check that queues contain correct message count via QMF
self.startQmf();
for i in range(in_loops):
sq = self.qmf_session.getObjects(_class="queue", name=loc_q_name % i)[0];
self.assertEqual (sq.msgDepth, msg_cnt);
# receive one (first) message from the queues
for i in range(in_loops):
loc_sess[i].message_subscribe(destination="dlq", queue=loc_q_name % i);
loc_sess[i].message_flow(destination="dlq", value=0xFFFFFFFFL,
unit=loc_sess[i].credit_unit.message)
loc_sess[i].message_flow(destination="dlq", value=0xFFFFFFFFL,
unit=loc_sess[i].credit_unit.byte)
dlq = loc_sess[i].incoming("dlq");
msg=dlq.get(timeout=1);
self.assertEqual(msg_layout % 0, msg.body);
# check that queues are present at this point (subscription still alive atm)
for i in range(in_loops):
# browse sessions
result = loc_sess[i].queue_query(queue=loc_q_name % i);
self.assertEqual(loc_q_name % i, result.queue);
loc_sess[i].close();
# check that queues are still available (after local sessions JUST closed)
for i in range(in_loops):
# browse sessions
result = sess.queue_query(queue=loc_q_name % i);
self.assertEqual(loc_q_name % i, result.queue);
print "sleeping - waiting for queue auto timeout"
time.sleep(q_timeout+AD_TIMEOUT_TOL);
# check whether queue has been deleted (expected to be deleted)
for i in range(in_loops):
result = sess.queue_query(queue=loc_q_name % i);
self.assert_(not result.queue);
Analysis:
The ClusterTimer is unable to handle storing two timer tasks that have the same
name. The Queue code creates a timer task for each auto delete queue. These
tasks all have the same name "DelayedAutoDeletion". This causes
ClusterTimer::add() to throw an exception as it thinks there are duplicate
timer tasks.
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