OOM when using JMX purge on a Queue with lots of messages in it
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Key: AMQ-2468
URL: https://issues.apache.org/activemq/browse/AMQ-2468
Project: ActiveMQ
Issue Type: Bug
Components: Broker
Affects Versions: 5.3.0
Reporter: Gary Tully
Assignee: Gary Tully
Fix For: 5.4.0
the problem is worse when there is a slow consumer and steady producer in the
mix.
Problem is that purge forces a page in and a dispatch but the dispatch ends up
appending to pagedInPending which is not limited and not bound by the usage
metrics so it only appears as an OOM.
Fixing purge to not dispatch helps but the presence of a consumer incurs a
dispatch on message sending so over time a steady producer will give the same
behavior.
Purge is a special case that highlights the problem of no restriction on
pagedInPending with a very slow consumer. If consumers can keep up, or if
producer flow control is used, or lazyDispatch, this issue can be avoided.
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