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Date: Wed, 1 Dec 2010 18:29:06 +0000
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Subject: Re: Too many open files
From: Robert Newson <robert.newson@gmail.com>
To: user@couchdb.apache.org
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look in /proc/<pid/limits to see if your tweak to limits.conf works. I
doubt it does.

The way I increase fd limits from the miserly Linux default of 1024 is
with this run script, where couchdb is launched by runit;

#!/bin/bash
exec 2>&1
export HOME=3D<dir>
ulimit -n 10000
exec chpst -u <user> couchdb -f

B.




On Wed, Dec 1, 2010 at 6:21 PM, Jonathan Johnson <jon@core-apps.com> wrote:
> Our couch setup has around 100 databases with a significant number of
> views in each database. Every once in a while, couch takes a dive. I
> happened to be around this time, and saw this in the logs:
>
>
> [Wed, 01 Dec 2010 18:09:19 GMT] [error] [<0.102.0>] {error_report,<0.31.0=
>,
> =A0 =A0{<0.102.0>,std_error,
> =A0 =A0 {mochiweb_socket_server,225,{acceptor_error,{error,accept_failed}=
}}}}
>
> [Wed, 01 Dec 2010 18:09:19 GMT] [error] [<0.10711.1125>] {error_report,<0=
.31.0>,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0{<0.10711.1125>,std_error,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 [{application,mochiweb},
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0"Accept failed error","{error,emfile}"]}}
>
> [Wed, 01 Dec 2010 18:09:19 GMT] [error] [<0.10711.1125>] {error_report,<0=
.31.0>,
> =A0 =A0{<0.10711.1125>,crash_report,
> =A0 =A0 [[{initial_call,{mochiweb_socket_server,acceptor_loop,['Argument_=
_1']}},
> =A0 =A0 =A0 {pid,<0.10711.1125>},
> =A0 =A0 =A0 {registered_name,[]},
> =A0 =A0 =A0 {error_info,
> =A0 =A0 =A0 =A0 =A0 {exit,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 {error,accept_failed},
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 [{mochiweb_socket_server,acceptor_loop,1},
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0{proc_lib,init_p_do_apply,3}]}},
> =A0 =A0 =A0 {ancestors,
> =A0 =A0 =A0 =A0 =A0 [couch_httpd,couch_secondary_services,couch_server_su=
p,<0.32.0>]},
> =A0 =A0 =A0 {messages,[]},
> =A0 =A0 =A0 {links,[<0.102.0>]},
> =A0 =A0 =A0 {dictionary,[]},
> =A0 =A0 =A0 {trap_exit,false},
> =A0 =A0 =A0 {status,running},
> =A0 =A0 =A0 {heap_size,233},
> =A0 =A0 =A0 {stack_size,24},
> =A0 =A0 =A0 {reductions,202}],
> =A0 =A0 =A0[]]}}
>
> [Wed, 01 Dec 2010 18:09:19 GMT] [error] [<0.102.0>] {error_report,<0.31.0=
>,
> =A0 =A0{<0.102.0>,std_error,
> =A0 =A0 {mochiweb_socket_server,225,{acceptor_error,{error,accept_failed}=
}}}}
>
> I had run into an open files limit before, and had adjusted a few
> settings. Here are some of the config values I think are relevant:
>
> max_dbs_open =3D 100
> max_connections =3D 2048
>
> From /etc/security/limits.conf
> couchdb =A0 =A0 =A0 =A0 hard =A0 =A0nofile =A04096
> couchdb =A0 =A0 =A0 =A0 soft =A0 =A0nofile =A04096
>
> The installed version is 1.0.1.
>
> I'm not sure how to debug this issue further. It only happens after
> several days of usage, and once it happens, I can't even ask for the
> stats page to see what the current numbers are :)
>
> Thanks in advance for any help!
> -Jon
>