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https://issues.apache.org/jira/browse/ARTEMIS-1011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15899681#comment-15899681
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Justin Bertram commented on ARTEMIS-1011:
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The whole goal with the getRate() method is to ensure that the queue has
actually received enough messages to service the consumers. In other words,
it's not "fair" to consider a consumer "slow" when the consumer doesn't even
have a chance to consume enough messages to satisfy the threshold. At this
point I think getRate() should remain unchanged and that
{{SlowConsumerReaperRunnable#run}} should treat this as a special case. I'm
working on a solution now.
> Slow consumer detection - producer msg/s rate for queue should take into
> account messages which are already in queue
> --------------------------------------------------------------------------------------------------------------------
>
> Key: ARTEMIS-1011
> URL: https://issues.apache.org/jira/browse/ARTEMIS-1011
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Components: Broker
> Affects Versions: 1.5.3
> Reporter: Miroslav Novak
> Fix For: 2.0.0, 1.5.4
>
>
> There is still a problem how producer msg/s rate is calculated in
> {{QueueImpl.getRate()}} for slow consumer detection. It calculates only
> messages added during the last slow consumer check period. As this is used to
> figure out, in which msg/s rate the queue could serve the consumer then it
> should also take into account messages which are already in queue at the
> start of queueRateCheckTime period.
> Current implementation is problem for cases when messages are sent to queue
> in bursts, for example producer sends 1000s messages in a few seconds and
> then stops and will do that again in 1 hour. QueueImpl.getRate() method
> returns 0 msg/s for slow consumer check period set to for example 5 min and
> slow consumer detection will be skipped.
> I tried to fix it by following change to QueueImpl.getRate() method and seems
> to be ok, wdyt?
> {code}
> private final AtomicLong messageCountSnapshot = new AtomicLong(0);
> public float getRate() {
> long locaMessageAdded = getMessagesAdded();
> float timeSlice = ((System.currentTimeMillis() -
> queueRateCheckTime.getAndSet(System.currentTimeMillis())) / 1000.0f);
> if (timeSlice == 0) {
> messagesAddedSnapshot.getAndSet(locaMessageAdded);
> return 0.0f;
> }
> return BigDecimal.valueOf(((locaMessageAdded -
> messagesAddedSnapshot.getAndSet(locaMessageAdded)) +
> messageCountSnapshot.getAndSet(getMessageCount())) / timeSlice).setScale(2,
> BigDecimal.ROUND_UP).floatValue();
> }
> {code}
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