Pavel Moravec created QPID-4343:
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Summary: cluster initial update stall when a queue has >10k
messages with message groups set
Key: QPID-4343
URL: https://issues.apache.org/jira/browse/QPID-4343
Project: Qpid
Issue Type: Bug
Components: C++ Broker
Affects Versions: 0.18
Reporter: Pavel Moravec
Attachments: bz854666.patch
Description of problem:
Having qpid broker in a cluster and using message groups, an attempt to join a
clustered peer causes cluster stall during initial update process, when some
queue has >10k messages with message groups set.
The reason is that updater node sends information about message groups in
ClusterConnectionQueueObserverStateBody message (exactly one message per one
queue). If some queue has "too much" messages with msg.groups, such
ClusterConnectionQueueObserverStateBody message does not fit into one AMQP
frame and it is silently(!) dropped by the updater.
Updatee node then waits for the message while updater node (and consequently
whole cluster) waits for updatee to mark itself as ready.
Version-Release number of selected component (if applicable):
0.14-21, almost surely in 0.18
How reproducible:
100%
Steps to Reproduce:
1. Have 2node cluster with 1 node running
2. Produce at least 10k messages with message groups to it:
qpid-send --group-key "GROUP_KEY" -m 10000 -a "groupQ; {create:always,
node:{type:queue, x-declare:{ arguments:{'qpid.group_header_key':'GROUP_KEY',
'qpid.shared_msg_group':1 }}}}"
3. (re)start 2nd node twice - due to some unknown reason, the first start
succeeds while the second does not.
Actual results:
New joiner stalls the cluster.
Expected results:
No broker joining a cluster can stall the cluster.
Additional info:
patch proposed
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