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Subject: Re: Help understanding crash log
From: Adam Kocoloski <kocolosk@apache.org>
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Date: Thu, 1 May 2014 09:18:30 -0400
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To: user@couchdb.apache.org

On May 1, 2014, at 8:47 AM, Interactive Blueprints =
<p.van.der.eems@interactiveblueprints.nl> wrote:

> 2014-05-01 13:14 GMT+02:00 Herman Chan <hermanccw@gmail.com>:
>> Thanks Adam,
>>=20
>> It seems like it is happening again, with more info this time.  It =
looks like I am hitting some sort of system limit, can anyone point out =
where to look next?
>=20
> Just guessing here..
> What could be is that you hit the max open file limit of your system.
> With "ulimit -a" you can see the limits on your system.
> Usually the max open file limit is somewhere around 1024.
> I noticed that couchdb loves to have a lot of files open =
simultaneously.
>=20
> Iin the same shell you start couchdb, right before you start couchdb,
> you can do a "ulimit -a 4096" (or another large value), this should
> give coudhb the ability to open more files.
>=20
> Hope this helps.
>=20
> Pieter van der Eems
> Interactive Blueprints

That's a good thought Pieter, though typically in that case you'll see =
an 'emfile' error in the logs. This particular system_limit error (with =
{erlang, spawn_link, ...} following it) occurs when the Erlang VM has =
reached the maximum number of processes it's allowed to spawn. Judging =
from the *long* list of processes linked to couch_httpd in this =
stacktrace I'd say Herman's client is improperly leaving connections =
open. Herman, did you intend to have 1000s of open TCP connections on =
this server? Regards,

Adam=