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From Jonathan Johnson <>
Subject Re: all_dbs_active error, not sure how to "fix"
Date Sat, 23 Apr 2011 13:38:32 GMT
Great, that does sound like a candidate for what I'm seeing.

Thank you!

On Fri, Apr 22, 2011 at 3:49 PM, Damien Katz <> wrote:
> There is/was a bug where the view indexer kept open a reference to the db
> file forever, which was a problem with compaction leaking file handles as
> well. Don't have time to look to see what's the status of the bug and fix,
> but's likely the source of your problem.
> -Damien
> On 4/22/11 7:45 AM, "Jonathan Johnson" <> wrote:
>>As I mentioned in my email, even after killing all of my server
>>processes, couch doesn't give back the open databases.
>>I am using Erlang 5.6.5 on 64-bit, so that could very well be the
>>issue. How can I tell if I'm using the version that has the bug -- is
>>it fixed in the current version of Erlang? I believe I'm using erlang
>>installed from yum.
>>Thanks for your help!
>>On Fri, Apr 22, 2011 at 9:36 AM, Filipe David Manana
>><> wrote:
>>> On Fri, Apr 22, 2011 at 3:30 PM, Jonathan Johnson <>
>>>> By doing that, it will increase the number of possible open files
>>>> (although I admit I'm significantly lower than my current limit). My
>>>> point is that I'm never actively connecting to 130 databases, so why
>>>> is couch keeping them open? Shouldn't it recycle databases that hadn't
>>>> been connected to recently?
>>> Yes it should. I dunno, perhaps your application or library is doing
>>> database accesses behind the scenes.
>>> Also, if you change your machine's clock while Couch is running, I
>>> think it might prevent it from properly recycling databases.
>>> Finally, if you're using Erlang OTP R14B02 on a 64 bits machine,
>>> there's a bug in that particular release regarding insertion in
>>> ordered ets tables, which might cause Couch to not do the recycling as
>>> it should.
>>>> -Jon
>>>> On Fri, Apr 22, 2011 at 9:05 AM, Filipe David Manana
>>>> <> wrote:
>>>>> Look at the "max_dbs_open" configuration parameter in the .ini files
>>>>> and increase it to a higher value.
>>>>> On Fri, Apr 22, 2011 at 3:01 PM, Jonathan Johnson <>
>>>>>> I'm running couchdb 1.0.2 on CentOS 5.5. The databases are on an
>>>>>> formatted drive.
>>>>>> I have 209 databases, but they're never truly active at the same
>>>>>> Our stack is written in ruby. The web layer switches between active
>>>>>> databases depending on the url. However, we have 16 web processes,
>>>>>> in theory the maximum number of truly active databases is 16.
>>>>>> We also have a daemon process that loops through a chunk of the
>>>>>> databases periodically. However, it's one thread, and as such also
>>>>>> only truly works with one database at a time.
>>>>>> My understanding is that CouchRest doesn't keep HTTP connections
>>>>>> for multiple requests, but I don't know that for sure. I have even
>>>>>> gone as far as putting in manual garbage collection calls in my
>>>>>> to ensure that any stranded connection objects will be collected.
>>>>>> With all of that, however, I eventually get into a state where I
>>>>>> the all_dbs_active error. It doesn't happen often -- last time was
>>>>>> nearly 3 weeks ago. However, once it gets in the state, restarting
>>>>>> of my clients doesn't release the databases. The only way to recover
>>>>>> is to restart couch.
>>>>>> open_os_files was at 2308 before I restarted it this morning, which
>>>>>> less than the current limit set (4096).
>>>>>> I guess I feel like this is an issue inside of couch because even
>>>>>> quit all of my active server processes that connect to couch, couch
>>>>>> never frees up the open databases. I can hit it one-off from my
>>>>>> browser and still get the error, even though I'm the only active
>>>>>> connection.
>>>>>> Has anyone else seen this? Any ideas of what I can try to prevent
>>>>>> from happening?
>>>>>> Thanks!
>>>>>> -Jon
>>>>> --
>>>>> Filipe David Manana,
>>>>> "Reasonable men adapt themselves to the world.
>>>>>  Unreasonable men adapt the world to themselves.
>>>>>  That's why all progress depends on unreasonable men."
>>> --
>>> Filipe David Manana,
>>> "Reasonable men adapt themselves to the world.
>>>  Unreasonable men adapt the world to themselves.
>>>  That's why all progress depends on unreasonable men."

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