Speed up initial message delivery for offline durable sub with
keepDurableSubsActive=true and JDBC store
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Key: AMQ-3196
URL: https://issues.apache.org/jira/browse/AMQ-3196
Project: ActiveMQ
Issue Type: Improvement
Components: Message Store
Affects Versions: 5.4.2
Reporter: Gary Tully
Assignee: Gary Tully
Fix For: 5.5.0
Follow on from https://issues.apache.org/jira/browse/AMQ-3188
Durablesubs are kept active by default, but their cursors are stopped requiring
a read of the store to determine the message backlog. With a large prioritised
backlog and th JDBC store, getting the store size can be costly as it requires
a full table scan.
Currently there are three calls to getStoreSize, there should be only one when
the sub is initially created.
The implication is that on reactivation of an offline durable sub, there is a
delay of an additional potentially slow jdbc call before dispatch resumes.
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