[rabbitmq-discuss] Excessive memory consumption of one server in cluster setup

Mon Aug 27 10:55:38 BST 2012

Just to make sure, I stopped the application, reset it, and rejoined the
cluster (on server2).
Thus, any "old" information in mnesia that could have caused that strange
behavior should
be wiped out.

Cheers
Matthias

On Mon, Aug 27, 2012 at 11:26 AM, Matthias Reik <matthias.reik at gmail.com>wrote:

> I just upgraded to 2.8.6, and I see the same effect with the latest
> version :-(
> (not really unexpected, since nothing was fixed in that regard in 2.8.6).
>
> Already after about 10 minutes server2 consumes 200% more memory than
> server1,
> even though all clients are connected to server1, and there are no queues
> with TTL anymore.
>
> (removing the other queues is unfortunately not possible, since it's a
> production
> server :-(, and I haven't seen this effect on any of our other
> (development) servers)
>
> Cheers
> Matthias
>
>
> On Fri, Aug 24, 2012 at 2:25 PM, Matthias Reik <maze at reik.se> wrote:
>
>> Hi,
>>
>> 2 days ago I have upgraded our RabbitMQ cluster (2 machines running in HA
>> mode) from 2.8.1 to 2.8.5.
>> Mainly to get those OOD fixes in, since we experienced those exact issues.
>>
>> The upgrade went very smooth, but at some point one of the machines
>> (server2) started to allocate more
>> and more memory (even though all queues are more or less at 0 with almost
>> no outstanding acks)
>>
>> server 1 uses ~200Mb
>> server 2 (at the point where I took it down) used ~6Gb
>>
>> I run a rabbitmqctl report... but it didn't give me any insights
>> I run a rabbitmqctl eval 'erlang:memory().' but that didn't tell me too
>> much more (but I will attach that at the end)
>>
>> I found people with similar problems:
>> http://grokbase.com/t/**rabbitmq/rabbitmq-discuss/**
>> 1223qcx3gg/rabbitmq-memory-**usage-in-two-node-cluster<http://grokbase.com/t/rabbitmq/rabbitmq-discuss/1223qcx3gg/rabbitmq-memory-usage-in-two-node-cluster>
>> but that's a while back so many things might have changed since then.
>> Also the memory difference was
>> rather minimal, whereas here the difference is _very_ significant,
>> especially since the node with less load
>> has the increased memory footprint.
>>
>> I can upgrade to 2.8.6 (unfortunately I upgraded just before it was
>> released :-(), but I only want to do that if
>> there is some hope that the problem is solved.
>> I can bring server2 back online and try to investigate what is consuming
>> that much memory, but my
>> RabbitMQ/Erlang knowledge is not good enough, therefore reaching out for
>> some help.
>>
>> So any help would be much appreciated.
>>
>> Thx
>> Matthias
>>
>> Our setup is something like the following:
>>       2 servers exclusively running RabbitMQ on CentOS 5.x (high
>> watermark ~22Gb),
>>             - both with web-console enabled
>>             - both defined as disk nodes
>>             - both running RabbitMQ 2.8.5 on Erlang R15B01 (after the
>> upgrade, Erlang was already at R15 before)
>>     10 queues configured with mirroring
>>       3 queues configured (without mirroring) only on server1 with a TTL
>>     Most consumers are connecting to server1, server2 only in case of
>> failover
>>
>> We get about 1k messages/sec (with peaks much higher than that) into the
>> system, and each message is
>> passed through several queues for processing.
>>
>> -bash-3.2$ sbin/rabbitmqctl eval 'erlang:memory().'
>> [{total,5445584424},
>>  {processes,2184155418},
>>  {processes_used,2184122352},
>>  {system,3261429006},
>>  {atom,703377},
>>  {atom_used,678425},
>>  {binary,3216386480},
>>  {code,17978535},
>>  {ets,4142048}]
>> ...done.
>> ______________________________**_________________
>> rabbitmq-discuss mailing list
>> rabbitmq-discuss at lists.**rabbitmq.com<rabbitmq-discuss at lists.rabbitmq.com>
>> https://lists.rabbitmq.com/**cgi-bin/mailman/listinfo/**rabbitmq-discuss<https://lists.rabbitmq.com/cgi-bin/mailman/listinfo/rabbitmq-discuss>
>>
>
>
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