[rabbitmq-discuss] Nightlies now available - help us test RabbitMQ 3.0

[Brendan Hay]

On Sun, Oct 21, 2012 at 7:06 PM, Simon MacMullen <simon at rabbitmq.com> wrote:

> On 20/10/2012 12:27PM, Matthias Radestock wrote:
>
>> Why are we concerned about the performance of http / json? Neither
>> appear in the AMQP message path. So what are we trying to improve here?
>> The management API/UI? Web-STOMP? I am not aware of many complaints
>> about the performance of these, and certainly not any that would point
>> to the json codec or http handling as the bottleneck.
>>
>
> When I did performance testing of mgmt a year or so ago, I found that JSON
> encoding really *is* the bottleneck in many cases - this is the reason why
> the ?columns= parameter exists, and also why it's implemented in terms of
> throwing away information just before we encode it.
>
> But no, unless someone has a good reason for why HTTP API performance is a
> big deal for them, faster JSON is pretty low down the list of priorities.
>

In my case, it's simply to lower the overhead of making repeated calls to
the HTTP API for monitoring and statistics services.

A current example where we see poor performance is when attempting to get
connection metrics from a single node, with in excess of 10K connections.
The Web UI or some other HTTP GET to the /connections endpoint takes
multiple seconds on an averagely utilised machine, even when using ?columns=

Obviously I'd like to a) have granular and informative monitoring and
statistics, but b) avoid monitoring software causing undue load

It would classify it as a nice to have, and I brought it up since the
current bundling of cowboy + mochiweb was mentioned.


> Cheers, Simon
>
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