How can Memory percent used be 100 if cursorMemoryHighWaterMark is 70%

[alainkr <ak...@gmail.com>]

Hello,

Using activemq 5.10.0 we had a production issue where Memory percent used
was 100%


I've beeing trying to reproduce but I can't get the memory used % above the
default cursorMemoryHighWaterMark of 70 %

I've trying "flooding" several queues with huge messages but I can't get
passed 74% memory usage.
I've tried to start several consumer with the default prefetch of 1000 which
I thought was going to bring back a lot of message back in memory but no :
memory remains at 74%

So under what circumstance can the Memory Used approach 100% like we had in
production ?

Thanks for your help

Alain




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Re: How can Memory percent used be 100 if cursorMemoryHighWaterMark is 70%

[alainkr <ak...@gmail.com>]

Okay thanks.





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Re: How can Memory percent used be 100 if cursorMemoryHighWaterMark is 70%

[Tim Bain <tb...@alumni.duke.edu>]

Large messages are one way. The broker will only refuse to accept a message
if the store is above the high water mark, not if the message will push it
above the high water mark, so if it's at 69% and you enqueue a very large
message that's 31% of the limit, you'd get to 100% (and the store would
then refuse to accept more messages).

Another is a bug in the code that computes the stats, and there have been
several of those over the years. Offhand I don't remember which versions
they were fixed in, but you could go through the relevant JIRA issues to
see if maybe an upgrade would help.

Tim

On Jan 15, 2018 3:44 PM, "alainkr" <ak...@gmail.com> wrote:

> Hello,
>
> Using activemq 5.10.0 we had a production issue where Memory percent used
> was 100%
>
>
> I've beeing trying to reproduce but I can't get the memory used % above the
> default cursorMemoryHighWaterMark of 70 %
>
> I've trying "flooding" several queues with huge messages but I can't get
> passed 74% memory usage.
> I've tried to start several consumer with the default prefetch of 1000
> which
> I thought was going to bring back a lot of message back in memory but no :
> memory remains at 74%
>
> So under what circumstance can the Memory Used approach 100% like we had in
> production ?
>
> Thanks for your help
>
> Alain
>
>
>
>
> --
> Sent from: http://activemq.2283324.n4.nabble.com/ActiveMQ-User-
> f2341805.html
>