<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Wed, Nov 20, 2013 at 11:41 AM, Matthias Radestock <span dir="ltr"><<a href="mailto:matthias@rabbitmq.com" target="_blank">matthias@rabbitmq.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 20/11/13 19:10, Graeme N wrote:<br>
<div class="im"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Looking at the files under<br>
/var/lib/rabbitmq/mnesia/<u></u>rabbit@hostname/msg_store_<u></u>persistent on our<br>
busiest host, and we see ~390 files, all <= 17 MiB. Compare to MySQL or<br>
Riak, where we split the InnoDB or Bitcask append-only logs at 500 MiB,<br>
which is chosen so it fits inside of our hardware RAID controllers' BBU<br>
caches.<br>
</blockquote>
<br></div>
The msg_store file size is configurable. See msg_store_file_size_limit at <a href="http://www.rabbitmq.com/configure.html#config-items" target="_blank">http://www.rabbitmq.com/configure.html#config-items</a>. If you want to set that to 500MiB, go for it.<br>
</blockquote><div><br></div><div>Well, the docs do explicitly say "You almost certainly
should not change this." Given the lack of stability we've seen with persistent queues so far, we've definitely shied away from touching anything the docs say not to, for fear of increasing stability problems. Do you have further guidance on this option that's not present in the docs about why you would/wouldn't change this option? For instance, is this safe to increase on active clusters which already have a lot of data in existing files?<br>
<br></div><div>Graeme<br><br> </div></div></div></div>