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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-3288) JDBC persistence adapter, intermittent performance degradation when a durable subscriber of priority messages falls behind
Date Wed, 20 Apr 2011 10:14:05 GMT
JDBC persistence adapter, intermittent performance degradation when a durable subscriber of
priority messages falls behind
--------------------------------------------------------------------------------------------------------------------------

                 Key: AMQ-3288
                 URL: https://issues.apache.org/jira/browse/AMQ-3288
             Project: ActiveMQ
          Issue Type: Bug
          Components: Message Store
    Affects Versions: 5.5.0
            Reporter: Gary Tully
            Assignee: Gary Tully
             Fix For: 5.6.0


Scenario: Messages are produced with rolling priority - jmsPriority = sendCount%10 so there
are always high priority messages in the mix.
One durable client attempting to catch up when being behind by 100k messages.

Symptom: About the time the priority of messages being consumed switched from 9, to 8, the
delay happened. Why it was happening, the log scrolled very fast with the percentage of memory
use change debug command. Delivery was suspended.
This happened for about a minute or so. During this time, one cleanup timer tripped, there
wasn't any delay for the cleanup sql.

It was strange, before the delay, the warning about memory stayed around 100% or so, but during
the delay, it jumped up to 4000%.

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