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From Jonathan Johnson <...@core-apps.com>
Subject Re: Too many open files
Date Wed, 01 Dec 2010 20:10:40 GMT
Thanks for the explanation :)

Well, all of this is now making sense a little better now. With Paul's
tip on what sort of requirements of open files I need, it's clear that
now the time has come to refactor a bit of my code to make it more
infrequent that we open up all of the databases. For now, I can change
the init script to properly set the limits, and that will be a bandaid
until I can properly test that refactoring :)

Thanks for your help, everyone! I went off to lunch, and then thought
to myself, "I wonder if I have any responses." Lo and behold, I did :)

-Jon




On Wed, Dec 1, 2010 at 2:00 PM, Robert Newson <robert.newson@gmail.com> wrote:
> You aren't launching couchdb with anything that supports PAM.
>
> look in /etc/pam.d for a list of services that will honor limits.conf.
>
> On my system (Debian), /etc/pam.d/su does not honor limits.conf by
> default. Even if you enable it, the couchdb startup script doesn't use
> su anyway, so it still doesn't help.
>
> shorter version: PAM and limits.conf is for interactive users, not daemons.
>
> B.
>
> On Wed, Dec 1, 2010 at 7:55 PM, Jonathan Johnson <jon@core-apps.com> wrote:
>> Ah, you're absolutely right -- it didn't work. I'm still at 1024
>> files. Well, that answers part of the question. If all else fails, I
>> could use your method by updating the init.d script a little.
>>
>> Does anyone have any ideas as to why the limits.conf doesn't work? I
>> know my way around setting up a system, but this level of
>> configuration is currently a little above my head :)
>>
>> -Jon
>>
>>
>> On Wed, Dec 1, 2010 at 12:29 PM, Robert Newson <robert.newson@gmail.com> wrote:
>>> 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=<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>,
>>>>    {<0.102.0>,std_error,
>>>>     {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>,
>>>>              {<0.10711.1125>,std_error,
>>>>               [{application,mochiweb},
>>>>                "Accept failed error","{error,emfile}"]}}
>>>>
>>>> [Wed, 01 Dec 2010 18:09:19 GMT] [error] [<0.10711.1125>] {error_report,<0.31.0>,
>>>>    {<0.10711.1125>,crash_report,
>>>>     [[{initial_call,{mochiweb_socket_server,acceptor_loop,['Argument__1']}},
>>>>       {pid,<0.10711.1125>},
>>>>       {registered_name,[]},
>>>>       {error_info,
>>>>           {exit,
>>>>               {error,accept_failed},
>>>>               [{mochiweb_socket_server,acceptor_loop,1},
>>>>                {proc_lib,init_p_do_apply,3}]}},
>>>>       {ancestors,
>>>>           [couch_httpd,couch_secondary_services,couch_server_sup,<0.32.0>]},
>>>>       {messages,[]},
>>>>       {links,[<0.102.0>]},
>>>>       {dictionary,[]},
>>>>       {trap_exit,false},
>>>>       {status,running},
>>>>       {heap_size,233},
>>>>       {stack_size,24},
>>>>       {reductions,202}],
>>>>      []]}}
>>>>
>>>> [Wed, 01 Dec 2010 18:09:19 GMT] [error] [<0.102.0>] {error_report,<0.31.0>,
>>>>    {<0.102.0>,std_error,
>>>>     {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 = 100
>>>> max_connections = 2048
>>>>
>>>> From /etc/security/limits.conf
>>>> couchdb         hard    nofile  4096
>>>> couchdb         soft    nofile  4096
>>>>
>>>> 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
>>>>
>>>
>>
>

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