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From: Paul Davis <paul.joseph.davis@gmail.com>
Date: Thu, 11 Aug 2011 14:18:17 -0500
Message-ID: 
 <CAJ_m3YAt90mayR8-Gqg-4Ln8XgD=J0VgKEuWQVNAS-x1tdjCcw@mail.gmail.com>
Subject: Re: gen_server timeout
To: user@couchdb.apache.org
Content-Type: text/plain; charset=ISO-8859-1

Bug tracker is here:

https://issues.apache.org/jira/browse/COUCHDB

Knowing that its related to reduce overflows might be enough, but
please open a ticket and paste any code you have in case I can't get
it to reproduce right away.

On Thu, Aug 11, 2011 at 1:52 PM, Michael <newmaniese@gmail.com> wrote:
> Definitely am able to reproduce this. One couchjs process is left for each
> reduce_overflow_error I have. I have a map/reduce function that is causing
> the reduce overflow error, if that is useful. Is this the best forum for
> posting those files or is there a bug tracker?
>
> Thanks,
>
> Michael
>
>
> On Thu, Aug 11, 2011 at 2:06 PM, Paul Davis <paul.joseph.davis@gmail.com>wrote:
>
>> Michael,
>>
>> If you have this narrowed down to a specific map/reduce pair or even a
>> design doc and some data it would be super helpful if you could find
>> something reproducible. Everything I've heard about this is that we're
>> losing track of couchjs processes which then ends up filling up the
>> os_process_limit which would eventually lead to this.
>>
>> The easiest way to check is to just watch "ps ax | grep couchjs | wc
>> -l" to see which HTTP calls lead to that number start increasing
>> beyond whatever a single request requires.
>>
>> My gut feeling is that this is a weird error condition where there's
>> an error in a reduce call or similar which manages to bypass a "return
>> process" type of call.
>>
>> Let me know if you find anything.
>>
>> Thanks,
>> Paul
>>
>> On Thu, Aug 11, 2011 at 12:47 PM, Michael <newmaniese@gmail.com> wrote:
>> > I just had the same thing happen last night after trying a bunch of
>> > reductions on a large set of data. All of a sudden all of my views were
>> > returning this error.
>> >
>> > This morning I came back to what I was working on and had the same
>> problem,
>> > all views were just returning this error.
>> >
>> > I restarted the couch service and everything seemed to be back on track.
>> > Next time it happens I will certainly look for these processes.
>> >
>> > I am running 1.1, once I am done with my work today I will try the same
>> > reductions and see if happens again.
>> >
>> > I just wanted to throw in that I saw this recently as well.
>> >
>> > Thanks,
>> >
>> > Michael
>> >
>> > On Thu, Aug 11, 2011 at 1:30 PM, Paul Davis <paul.joseph.davis@gmail.com
>> >wrote:
>> >
>> >> When this happens can you do a "ps ax | grep couchjs" on the machine
>> >> hosting CouchDB? It sounds like you've hit the process limit (which is
>> >> configurable). Hard to say if this is because you have lots of
>> >> concurrent clients holding couchjs processes or if we're leaking them
>> >> out of the pool somehow. If you can show that there aren't any clients
>> >> holding them (ie, from view updates or long list calls) then I'd be
>> >> super intrigued to see if you can narrow it down to a test case. I've
>> >> heard a couple anecdotes about leakage here but never with enough
>> >> detail to start looking for a root cause.
>> >>
>> >> On Thu, Aug 11, 2011 at 5:26 AM, Martin Hewitt <martin@thenoi.se>
>> wrote:
>> >> > I've put a log extract on Pastebin here: http://pastebin.com/PuJm08J0
>> >> >
>> >> > Sorry, I'm not familiar with erlang, so I'm not sure which bits are
>> >> pertinent, and there may well be more than one error trace in there.
>> >> >
>> >> > Any help would be greatly appreciated.
>> >> >
>> >> > Martin
>> >> >
>> >> > On 11 Aug 2011, at 11:14, Martin Hewitt wrote:
>> >> >
>> >> >> Hi all,
>> >> >>
>> >> >> I'm getting the following error when trying to load some views:
>> >> >>
>> >> >>
>> >>
>> {"error":"timeout","reason":"{gen_server,call,[couch_query_servers,{get_proc,<<\"javascript\">>}]}"}
>> >> >>
>> >> >> Googling around, it seems this issue has been "fixed" way before I
>> even
>> >> started using CouchDB. Any ideas what could be causing it now?
>> >> >>
>> >> >> Thanks,
>> >> >>
>> >> >> Martin
>> >> >
>> >> >
>> >>
>> >
>>
>