Pavel Moravec created QPID-7325:
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Summary: [C++ broker] Active HA broker memory leak when
creating&unsubscribing from an autoDel queue
Key: QPID-7325
URL: https://issues.apache.org/jira/browse/QPID-7325
Project: Qpid
Issue Type: Bug
Components: C++ Broker
Affects Versions: qpid-cpp-0.34
Reporter: Pavel Moravec
Having a consumer that (in a loop):
- creates an autoDelete queue
- subscribes to it
- unsubscribes
against a HA cluster, primary broker memory consumption grows over the time.
Steps to Reproduce:
1. Start 3 brokers in a HA cluster (mine reproducer uses options:
qpidd --port=5672 --store-dir=_5672 --log-to-file=qpidd.5672.log
--data-dir=_5672 --auth=no --log-to-stderr=no --ha-cluster=yes
--ha-brokers-url=localhost:5672,localhost:5673,localhost:5674 --ha-replicate=all
)
2. Run simple qpid-receive in a loop:
while true; do
qpid-receive -a "autoDelQueue; {create:always, node:{
x-declare:{auto-delete:True}}}"
sleep 0.1
done
3. Monitor memory usage of primary broker.
Observations from variants of reproducer:
- standalone broker does not exhibit that mem.leak
- even standalone broker in HA cluster does not - backup brokers are mandatory
for the leak
- anyway, replicator bridge queues on primary stand almost everytime empty, no
bursts of messages occur there.
- just the primary broker is affected, backups are OK
- amount of leaked memory does not depend on number of backups (very similar
mem.usage when having 1,2 or 4 backups)
- valgrind does not show any leaked or excessive "still reachable" memory, even
after 1 hour test where memory consumption of valgrind grew evidently
- curiously, every running "qpid-stat -q" causes _additional_ memory is leaked
- maybe due to the fact it uses auxiliary autoDel queue as well (but just one
while the leak is much bigger)?
- bug not is present in 0.30
- --ha-replicate=all is crucial, even --ha-replication=configuration does _not_
trigger the leak
- adding --enable-qmf2=no prevents most the leak - memory still grows (sic!)
but evidently slower
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