[jira] [Resolved] (QPID-7149) [HA] active HA broker memory leak when ring queue discards overflow messages

["Alan Conway (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/QPID-7149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alan Conway resolved QPID-7149.
-------------------------------
       Resolution: Fixed
    Fix Version/s: qpid-cpp-next

> [HA] active HA broker memory leak when ring queue discards overflow messages
> ----------------------------------------------------------------------------
>
>                 Key: QPID-7149
>                 URL: https://issues.apache.org/jira/browse/QPID-7149
>             Project: Qpid
>          Issue Type: Bug
>          Components: C++ Broker
>         Environment: RHEL6
> qpid trunk svn rev. 1735384
> - issue seen in very old releases (since active-passive HA cluster initial implementation, most probably)
> libstdc++-devel-4.4.7-4.el6.x86_64
> gcc-c++-4.4.7-4.el6.x86_64
> libgcc-4.4.7-4.el6.x86_64
> libstdc++-4.4.7-4.el6.x86_64
> gcc-4.4.7-4.el6.x86_64
>            Reporter: Pavel Moravec
>            Assignee: Alan Conway
>             Fix For: qpid-cpp-next
>
>
> There is a memory leak on active HA broker, triggered most probably by purging overflow message from a ring queue. Basic scenario is to setup HA cluster, promote to primary and feed forever a ring queue with messages.
> Detailed scenario:
> 1) Start brokers and promote one to primary:
> {noformat}
> start_broker() {
> 	port=$1
> 	shift
> 	rm -rf _${port}
> 	mkdir _${port}
> 	nohup qpidd --load-module=ha.so --port=$port --log-to-file=qpidd.$port.log --data-dir=_${port} --auth=no --log-to-stderr=no --ha-cluster=yes --ha-brokers-url="$(hostname):5672,$(hostname):5673,$(hostname):5674" --ha-replicate=all --acl-file=/root/qpidd.acl "$@" > /dev/null 2>&1 &
> 	sleep 1
> }
> killall qpidd qpid-receive 2> /dev/null
> rm -f qpidd.*.log
> start_broker 5672
> sleep 1
> qpid-ha promote -b $(hostname):5672 --cluster-manager
> sleep 1
> start_broker 5673
> sleep 1
> start_broker 5674
> {noformat}
> 2) Create ring queues and send there messages (it is enough to have 1 queue, having more should show the leak faster):
> {noformat}
> for i in $(seq 0 9); do
> 	qpid-config add queue FromKeyServer_$i --max-queue-size=10000 --max-queue-count=10 --limit-policy=ring --argument=x-qpid-priorities=10
> done
> while true; do
> 	for j in $(seq 1 10); do
> 		for i in $(seq 1 10); do
> 			for k in $(seq 0 9); do
> 				qpid-send -a FromKeyServer_$k -m 100 --send-rate=50 -- priority=$(($((RANDOM))%10)) &
> 			done
> 		done
> 		wait
> 		while [ $(qpid-stat -q | grep broker-replicator | sed "s/Y//g" | awk '{ print $2 }' | sort -n | tail -n1) != "0" ]; do
> 			sleep 1
> 		done
> 	done
> 	date
> 	ps aux | grep qpidd | grep "port=5672" | awk -F "--store-dir" '{ print $1 }'
> done
> {noformat}
> (the "while [ $(qpid-stat -q | .." cycle is there just to slow down the message enqueues to ensure replication federation queues dont have big backlog - that would interfere with memory consumpiton observation)
> 3) Run those scripts and monitor memory consumption.
> - without using priority queues and sending messages without priorities, leak is evident as well - sometimes smaller, sometimes the same
> - valgrind (on some older versions I tested before more thoroughly) detects nothing (neither leaked memory or reachable at shutdown)
> - same leak is evident even with --ha-replicate=none
> - number of backup brokers does not affect the memory leak



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