[rabbitmq-discuss] Possible memory leak in the management plugin

[Simon MacMullen]

Some things to look at that may let you re-enable the management plugin:

The management DB keeps historical data for queues / connections etc. If 
you have a large number of these things then tweaking the retention 
policies may help:

http://www.rabbitmq.com/management.html#sample-retention

If that does not help then setting:

{rabbitmq_management, [{db_module, rabbit_mgmt_old_db}]}

in your config will revert to the 3.0.x DB implementation.

Cheers, Simon

On 18/06/13 08:17, Joseph Lambert wrote:
> Hi,
>
> I just wanted to mention that we are seeing the same behavior, but we
> don't have any mirrored queues. We have had to disable the management
> interface and the memory usage gradually dropped.
>
> We are using 3.1.1 on R13B04 on some machines, and a few others with
> Erlang R16B.
>
> I looked into the code, and it creates some ets tables in the
> rabbit_mgmt_db module. The first snippet is memory usage with the
> management plugin:
>
>       {memory,
>           [{total,1417822136},
>            {connection_procs,37788152},
>            {queue_procs,6659896},
>            {plugins,686592},
>            {other_proc,11236576},
>            {mnesia,855184},
>            {mgmt_db,935311000},
>            {msg_index,7976224},
>            {other_ets,70559680},
>            {binary,13529704},
>            {code,19001963},
>            {atom,1601817},
>            {other_system,312615348}]},
>
>
> This second snippet is after disabling the management plugin and
> restarting one of the nodes:
>
>     [{total,190412936},
>
>     {memory,
>     {connection_procs,34512200},
>     {queue_procs,8970352},
>     {plugins,0},
>     {other_proc,9246776},
>     {mnesia,794776},
>     {mgmt_db,0},
>     {msg_index,1650736},
>     {other_ets,6406656},
>     {binary,63363448},
>     {code,16232973},
>     {atom,594537},
>     {other_system,48640482}]}
>
>
> You'll notice that the memory used by mgmt_db is not 0 and other_system
> is around 48MB, while before mgmt_db was over 935MB, and other_system
> over 300MB. Unfortunately, I don't have any growth trends for the DB
> size as we have had to disable management on all nodes and we weren't
> tracking this memory usage.
>
> I'm not very familiar with RabbitMQ, but if I have some time I will try
> and dig more deeply into it and run some tests.
>
> - Joe
>
> On Saturday, June 15, 2013 10:09:21 AM UTC+8, Travis Mehlinger wrote:
>
>     We recently upgraded RabbitMQ from 3.0.4 to 3.1.1 after noticing two
>     bug fixes in 3.1.0 related to our RabbitMQ deployment:
>
>       * 25524 fix memory leak in mirror queue slave with many
>         short-lived publishing channel
>       * 25290 fix per-queue memory leak recording stats for mirror queue
>         slaves
>
>     However, in our case, it seems that the management plugin may still
>     have a memory leak. We have a monitoring agent that hits the REST
>     API to gather information about the broker (number of queues, queue
>     depth, etc.). With the monitoring agent running and making requests
>     against the API, memory consumption steadily increased; when we
>     stopped the agent, memory consumption in the management plugin
>     leveled off.
>
>     Here a couple graphs detailing memory consumption in the broker (the
>     figures are parsed from rabbitmqctl report). The first graph shows
>     the ebb and flow of memory consumption in a number of components and
>     the second shows just consumption by the management plugin. You can
>     see pretty clearly where we stopped the monitoring agent at 1:20.
>
>     https://dl.dropboxusercontent.com/u/7022167/Screenshots/n-np6obt-m9f.png
>     <https://dl.dropboxusercontent.com/u/7022167/Screenshots/n-np6obt-m9f.png>
>     https://dl.dropboxusercontent.com/u/7022167/Screenshots/an6dpup33xvx.png
>     <https://dl.dropboxusercontent.com/u/7022167/Screenshots/an6dpup33xvx.png>
>
>     We have two clustered brokers, both running RabbitMQ 3.1.1 on Erlang
>     R14B-04.1. There are typically around 200 queues, about 20 of which
>     are mirrored. There are generally about 200 consumers. Messages are
>     rarely queued and most queues typically sit idle.
>
>     I'll be happy to provide any further diagnostic information.
>
>     Thanks!
>
>
>
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-- 
Simon MacMullen
RabbitMQ, Pivotal