[rabbitmq-discuss] Stats node getting slow

[Pierpaolo Baccichet]

Hello Simon,

Thanks for the response and yeah, my gut feeling went as well toward a leak
in that rewrite because in fact this issue started showing up when we
upgraded to 3.1.x. We ended up disabling the fine-grained stats last friday
as you mentioned in your last suggestion because people were getting paged
a bit too often :) The current config is below

[
    {rabbit, [
        {vm_memory_high_watermark, 0.75},
        {cluster_nodes, [
            'rabbit at xyz1',
            'rabbit at xyz2',
            'rabbit at xyz3'
        ]},
        {collect_statistics, coarse},
        {collect_statistics_interval, 10000}
    ]},
    {rabbitmq_management_agent, [
        {force_fine_statistics, false}
    ]}
].

I will give it a few more days with this config and then maybe revert to
help you figure this issue. A related question, is there a way to
programmatically figure which one is the stats node in the cluster? I could
not find the config in the HTTP API


On Mon, Nov 11, 2013 at 1:52 AM, Simon MacMullen <simon at rabbitmq.com> wrote:

> On 11/11/2013 9:45AM, Simon MacMullen wrote:
>
>> Hmm, the stats DB was more or less rewritten between 3.0.x and 3.1.0 (to
>> keep stats histories). If there's a memory leak in there I'd very much
>> like to get to the bottom of it.
>>
>
> Of course the other possibility is that the stats DB is simply overwhelmed
> with work and unable to keep up. It's supposed to start dropping incoming
> stats messages in this situation, but maybe it isn't. To determine if this
> is the case, look at:
>
> rabbitmqctl eval 'process_info(global:whereis_name(rabbit_mgmt_db),
> memory).'
>
> - and if the number that comes back looks like it would account for most
> of the memory used, then that is likely to be the problem. In that case you
> can slow down stats event emission by changing collect_statistics_interval
> (see http://www.rabbitmq.com/configure.html) and / or disable
> fine-grained stats as I mentioned in the previous message.
>
>
> Cheers, Simon
>
> --
> Simon MacMullen
> RabbitMQ, Pivotal
>
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