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From Paul Davis <paul.joseph.da...@gmail.com>
Subject Re: CouchDb not releasing files
Date Mon, 20 Sep 2010 20:42:45 GMT
Do you issue two compact commands simultaneously or wait for the first
one to complete and then run the second?


On Mon, Sep 20, 2010 at 4:07 PM, [mRg] <emargee@gmail.com> wrote:
> Well I can certainly reproduce the issue, but am having trouble finding the
> exact sequence (annoyingly of course)
>
> 1> I started with a blank VM of Ubuntu 10.10 (ext3) running on virtualbox
> with latest CouchDB (apt-get install couchdb)
> 2> Began adding lots of blank docs ..  (curl -X POST -H
> "Content-Type:application/json" http://localhost:5984/test -d {})
> 3> Created a simple view ("function(doc) {  emit(null, doc); }") and ran to
> ensure it wrote to disk.
> 4> I issued 2 compact commands (curl -X POST
> http://localhost:5984/test/_compact/ -H "Content-Type:application/json")
> 5> And began adding more documents again as before ..
>
> Repeating this, essentially creating view data and compacting it about 10
> times resulted in 4 'snagged' files
>
> root@ubuntu:~# lsof | grep -P 'COMMAND|/var/lib/couchdb/1.0.1'
> COMMAND    PID    USER   FD      TYPE     DEVICE SIZE/OFF       NODE NAME
> beam      1083 couchdb   13u      REG      252,0     4185        271
> /var/lib/couchdb/1.0.1/_users.couch
>>> beam      1083 couchdb   14u      REG      252,0   331865      
 275
> /var/lib/couchdb/1.0.1/.delete/4e000e0ae5cce3d275f09b4542396e85 (deleted)
>>> beam      1083 couchdb   16u      REG      252,0   602210      
 279
> /var/lib/couchdb/1.0.1/.delete/a9ee2b96c12591455ea795fa5324dc9c (deleted)
> beam      1083 couchdb   17u      REG      252,0   270434        283
> /var/lib/couchdb/1.0.1/.test_design/07ca32cf9b0de9c915c5d9ce653cdca3.view
> beam      1083 couchdb   18u      REG      252,0   204898        284
> /var/lib/couchdb/1.0.1/.test_design/540958c4124af3925fe467afb96f4906.view
> beam      1083 couchdb   20u      REG      252,0   405602        286
> /var/lib/couchdb/1.0.1/.test_design/f26a8fcc3d2ce226a9e652338882c3db.view
> beam      1083 couchdb   21u      REG      252,0   299106        287
> /var/lib/couchdb/1.0.1/.test_design/40614f8c8e1b4bab9d093881e914729d.view
>>> beam      1083 couchdb   22u      REG      252,0   106594      
 285
> /var/lib/couchdb/1.0.1/.delete/31909e936ce94db7a6cede72827b18b2 (deleted)
>>> beam      1083 couchdb   24r      REG      252,0   233570      
 288
> /var/lib/couchdb/1.0.1/.delete/83d09ec6dab90ca6078c0310085b97cc (deleted)
> beam      1083 couchdb   26u      REG      252,0   163932        281
> /var/lib/couchdb/1.0.1/.test_design/3486e8de398e27b8767afd4975691360.view
> beam      1083 couchdb   27w      REG      252,0   114786        289
> /var/lib/couchdb/1.0.1/test.couch
> beam      1083 couchdb   28u      REG      252,0   217186        280
> /var/lib/couchdb/1.0.1/.test_design/b450740e3245f89ab902db10d767a397.view
>
> .. while the bottom 2 marked with (deleted) hung around for about 20 minutes
> they eventually disappeared ..
>
> root@ubuntu:~# lsof | grep -P 'COMMAND|/var/lib/couchdb/1.0.1'
> COMMAND    PID    USER   FD      TYPE     DEVICE SIZE/OFF       NODE NAME
> beam      1083 couchdb   13u      REG      252,0     4185        271
> /var/lib/couchdb/1.0.1/_users.couch
>>> beam      1083 couchdb   14u      REG      252,0   331865      
 275
> /var/lib/couchdb/1.0.1/.delete/4e000e0ae5cce3d275f09b4542396e85 (deleted)
>>> beam      1083 couchdb   16u      REG      252,0   602210      
 279
> /var/lib/couchdb/1.0.1/.delete/a9ee2b96c12591455ea795fa5324dc9c (deleted)
> beam      1083 couchdb   17u      REG      252,0   270434        283
> /var/lib/couchdb/1.0.1/.test_design/07ca32cf9b0de9c915c5d9ce653cdca3.view
> beam      1083 couchdb   18u      REG      252,0   204898        284
> /var/lib/couchdb/1.0.1/.test_design/540958c4124af3925fe467afb96f4906.view
> beam      1083 couchdb   20u      REG      252,0   405602        286
> /var/lib/couchdb/1.0.1/.test_design/f26a8fcc3d2ce226a9e652338882c3db.view
> beam      1083 couchdb   21u      REG      252,0   299106        287
> /var/lib/couchdb/1.0.1/.test_design/40614f8c8e1b4bab9d093881e914729d.view
> beam      1083 couchdb   23u      REG      252,0   114786        288
> /var/lib/couchdb/1.0.1/test.couch
> beam      1083 couchdb   26u      REG      252,0   163932        281
> /var/lib/couchdb/1.0.1/.test_design/3486e8de398e27b8767afd4975691360.view
> beam      1083 couchdb   28u      REG      252,0   217186        280
> /var/lib/couchdb/1.0.1/.test_design/b450740e3245f89ab902db10d767a397.view
>
> .. but the top 2 did not and are still hanging around over an hour later ..
>
> I will keep looking to see if I can find the exact sequence ..
>
> On 20 September 2010 19:09, [mRg] <emargee@gmail.com> wrote:
>
>> I am trying to reproduce it currently on a fresh VM. It seems to be a
>> symptom of view compaction, after the file is moved to the .delete directory
>> and then finally deleted is where the problem seems to occur.
>>
>> I tried with a fresh ubuntu 10.10 but I couldnt reproduce but the system
>> I'm seeing it on is ext3 (ubuntu was ext4) so I'm going to start again with
>> that and report back.
>>
>> I did wonder how this would be reproduced in a test as you have to get
>> quite low level (using lsof) to see if the issue is manifesting itself :)
>>
>> Regards
>>
>> Stephen
>>
>> On 20 September 2010 16:00, Chris Anderson <jchris@apache.org> wrote:
>>
>>> On Sun, Sep 19, 2010 at 3:21 PM, Randall Leeds <randall.leeds@gmail.com>
>>> wrote:
>>> > If the bug is confirmed it should be on JIRA if it is not already. If
>>> > you have a test case that reproduces it that would be fanstastic
>>> > (bonus points for a JS test in Futon).
>>> >
>>> > It's my opinion something this serious should block 1.1, but
>>> > ultimately that is up to the committers to determine, yes?
>>> >
>>>
>>> I think this is pretty serious. It's probably a simple fix, so as soon
>>> as we have it reproducible, I'm sure it will get fixed.
>>>
>>> I'm not sure how it can be tested from JavaScript, any ideas?
>>>
>>> If not it should be testable via the Erlang tests.
>>>
>>> Chris
>>>
>>> > On Sun, Sep 19, 2010 at 22:09, [mRg] <emargee@gmail.com> wrote:
>>> >> Hi all,
>>> >>
>>> >> This is just a cross-post to highlight a thread on the user list. (with
>>> the
>>> >> same name as this one - all details etc are on there, happy to repeat
>>> here
>>> >> if needed). It seems this problem was discussed by some devs at
>>> CouchCamp
>>> >> and seems others are suffering this issue. I was just wondering if
>>> there was
>>> >> a JIRA issue related to this that I/we can track and if a fix for this
>>> will
>>> >> be included in any upcoming released (1.1 ?).
>>> >>
>>> >> Regards
>>> >>
>>> >> Stephen
>>> >>
>>> >
>>>
>>>
>>>
>>> --
>>> Chris Anderson
>>> http://jchrisa.net
>>> http://couch.io
>>>
>>
>>
>

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