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From "[mRg]" <emar...@gmail.com>
Subject Re: Couch not releasing deleted files
Date Sat, 18 Sep 2010 23:24:56 GMT
Has this been raised with the dev list or is there a bug raised for this
issue ? Seems a few people are having this and more are probably not seeing
yet.

On 15 September 2010 08:49, [mRg] <emargee@gmail.com> wrote:

> Yes there are 6 views (2 design docs)
>
>
> On 14 September 2010 21:51, Adam Kocoloski <kocolosk@apache.org> wrote:
>
>> Were there any view indexes on that DB?  My suspicion is that
>> couch_view_group misses a step somewhere in its dance and keeps a reference
>> to an old #db{}
>>
>> Adam
>>
>> On Sep 14, 2010, at 4:46 PM, [mRg] wrote:
>>
>> > It was just on a DB with a lot of writes (documents having lots of
>> > revisions, rather that lots of new docs), the database grows as expected
>> but
>> > after just doing a simple compact on the db the old files still seem to
>> be
>> > on disk as reported previously.
>> >
>> > It seems its been around a while now as (as far as we can see) 0.11 /
>> 1.0
>> > and 1.0.1 all have the same issue, when we replicated the same data over
>> to
>> > the newer versions the same identical problem happened.
>> >
>> > On 14 September 2010 14:49, Robert Newson <robert.newson@gmail.com>
>> wrote:
>> >
>> >> This was mentioned at CouchCamp, several developers suspect there's a
>> >> subtle bug in the code where file descriptors are not being closed
>> >> under some conditions.
>> >>
>> >> Did the OP identify a particular sequence that led here?
>> >>
>> >> B.
>> >>
>> >> On Mon, Sep 13, 2010 at 6:25 PM, Juan Jose Comellas <
>> juanjo@comellas.org>
>> >> wrote:
>> >>> I'm pretty certain it's a bug in CouchDB. I haven't checked the code,
>> but
>> >>> what is happening is that CouchDB is keeping file descriptors
>> >> corresponding
>> >>> to deleted files open, probably after compacting a database. I'm
>> >> inferring
>> >>> this based on the fact that with lsof I saw several cases of two files
>> >> with
>> >>> the same name (one deleted and one not) opened by CouchDB.
>> >>>
>> >>>
>> >>> On Mon, Sep 13, 2010 at 7:28 PM, [mRg] <emargee@gmail.com> wrote:
>> >>>
>> >>>> Is this an issue with the OS or with Couch/Beam itself ?
>> >>>>
>> >>>> On 10 September 2010 16:57, Juan Jose Comellas <juanjo@comellas.org>
>> >>>> wrote:
>> >>>>
>> >>>>> It also happened to me with Ubuntu 8.04 and CouchDB 0.10.x.
The only
>> >> way
>> >>>> I
>> >>>>> found to solve the problem was by restarting CouchDB.
>> >>>>>
>> >>>>>
>> >>>>> On Thu, Sep 9, 2010 at 10:25 AM, [mRg] <emargee@gmail.com>
wrote:
>> >>>>>
>> >>>>>> [CouchDB Version : 0.11]
>> >>>>>> [OS: RHEL 5.5]
>> >>>>>>
>> >>>>>> Hi all,
>> >>>>>>
>> >>>>>> We are seeing some odd behaviour with CouchDb not releasing
files
>> >> after
>> >>>>> it
>> >>>>>> has compacted them meaning we are seeing disk space continue
to
>> >>>> increase
>> >>>>>> until the service is restarted even though we have regular
>> >> compaction /
>> >>>>>> cleanup.
>> >>>>>>
>> >>>>>> Typical scenario : File system alert for disk space ..
>> >>>>>>
>> >>>>>> df says 5.5.GB used ..
>> >>>>>>
>> >>>>>> df -h | grep -P 'Filesystem|db'
>> >>>>>>
>> >>>>>> Filesystem            Size  Used Avail Use% Mounted on
>> >>>>>>
>> >>>>>>                     8.0G  5.5G  2.2G  72% /var/lib/db
>> >>>>>>
>> >>>>>>
>> >>>>>> .. but the files on the disk (and in Futon) say only 793MB
is being
>> >>>> used
>> >>>>> ..
>> >>>>>>
>> >>>>>>
>> >>>>>> du -sh /var/lib/db/*
>> >>>>>>
>> >>>>>> 793M     /var/lib/db/couchdb
>> >>>>>>
>> >>>>>>
>> >>>>>> .. running lsof shows the files marked as deleted but still
there
>> >> (I'm
>> >>>>>> assuming beam still has some kind of handle still open to
them) ..
>> >>>>>>
>> >>>>>>
>> >>>>>> lsof | grep -P 'COMMAND|/var/lib/db/couchdb/'
>> >>>>>>
>> >>>>>> COMMAND     PID      USER   FD      TYPE             DEVICE
>> >> SIZE
>> >>>>>> NODE NAME
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   12u      REG             253,10
>> >> 4183
>> >>>>>> 1210374
>> >>>>>>
>> >>>>>>
>> >>>>>
>> >>>>
>> >>
>> /var/lib/db/couchdb/.active_context_design/8efe9584a944f4b24b97f134f541d80f.view
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   16u      REG             253,10
>> >> 612039080
>> >>>>>> 1204227 /var/lib/db/couchdb/active_context.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   20u      REG             253,10
>> >> 180699242
>> >>>>>> 1204237 /var/lib/db/couchdb/active_context.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   21u      REG             253,10
>> >> 3133540
>> >>>>>> 2023429 /var/lib/db/couchdb/thesaurus.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   25u      REG             253,10
>> >> 71422052
>> >>>>>> 2023428 /var/lib/db/couchdb/active_context_schedule.couch
(deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   26u      REG             253,10
>> >> 71372900
>> >>>>>> 2056193 /var/lib/db/couchdb/active_context_schedule.couch
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   28u      REG             253,10
>> >> 621252717
>> >>>>>> 1204238 /var/lib/db/couchdb/active_context.couch
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   29u      REG             253,10
>> >> 1740903
>> >>>>>> 90113 /var/lib/db/couchdb/mapping_cache.couch
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   30u      REG             253,10
>> >> 3133540
>> >>>>>> 1204253 /var/lib/db/couchdb/thesaurus.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   31u      REG             253,10
>> >> 2318439
>> >>>>>> 1204240 /var/lib/db/couchdb/mappings.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   32u      REG             253,10
>> >> 983150
>> >>>>>> 2004994
>> >>>>>>
>> >>>>>
>> >>>>
>> >>
>> /var/lib/db/couchdb/.mappings_design/f9964c50b95c167c8ac3d8d3b4c76a4b.view
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   33u      REG             253,10
>> >> 3133540
>> >>>>>> 2056194 /var/lib/db/couchdb/thesaurus.couch
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   34u      REG             253,10
>> >> 70742116
>> >>>>>> 1204231 /var/lib/db/couchdb/active_context_schedule.couch
(deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   44u      REG             253,10
>> >> 1740903
>> >>>>>> 2023427 /var/lib/db/couchdb/mapping_cache.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   45u      REG             253,10
>> >> 65396836
>> >>>>>> 1994756 /var/lib/db/couchdb/active_context_schedule.couch
(deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   47u      REG             253,10
>> >> 71229540
>> >>>>>> 1204243 /var/lib/db/couchdb/active_context_schedule.couch
(deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   48u      REG             253,10
>> >> 240254078
>> >>>>>>  1204226 /var/lib/db/couchdb/active_context.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   49u      REG             253,10
>> >> 2232423
>> >>>>>> 1204241 /var/lib/db/couchdb/mappings.couch
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   51u      REG             253,10
>> >> 96903353
>> >>>>>> 1210371
>> >>>>>>
>> >>>>>>
>> >>>>>
>> >>>>
>> >>
>> /var/lib/db/couchdb/.active_context_design/b406f7bb6d01b6d50324f14cde588324.view
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   52u      REG             253,10
>> >> 1192034
>> >>>>>> 1249282
>> >>>>>>
>> >>>>>>
>> >>>>>
>> >>>>
>> >>
>> /var/lib/db/couchdb/.mapping_cache_design/8bbf80a6e1ca8f2c71ebc90c730e7190.view
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   53u      REG             253,10
>> >> 1622135
>> >>>>>> 2004993
>> >>>>>>
>> >>>>>
>> >>>>
>> >>
>> /var/lib/db/couchdb/.mappings_design/1ff69004b575837aae9d4147162197d4.view
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   54u      REG             253,10
>> >> 4172
>> >>>>>> 1208327
>> >>>>>>
>> >>>>>
>> >>>>
>> >>
>> /var/lib/db/couchdb/.thesaurus_design/73fe79b20ff06e341257fa78231ca87e.view
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   55u      REG             253,10
>> >> 13496483
>> >>>>>> 1208325
>> >>>>>>
>> >>>>>
>> >>>>
>> >>
>> /var/lib/db/couchdb/.thesaurus_design/fcc08d6e41c54c0d470c5984ea9eb6e3.view
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   56u      REG             253,10
>> >> 12959902
>> >>>>>> 1208326
>> >>>>>>
>> >>>>>
>> >>>>
>> >>
>> /var/lib/db/couchdb/.thesaurus_design/c06195da19f34ced37fa1ab91e663c73.view
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   57u      REG             253,10
>> >> 70254692
>> >>>>>> 1204236 /var/lib/db/couchdb/active_context_schedule.couch
(deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   58u      REG             253,10
>> >> 581730
>> >>>>>> 1210373
>> >>>>>>
>> >>>>>>
>> >>>>>
>> >>>>
>> >>
>> /var/lib/db/couchdb/.active_context_schedule_design/c64c047dcff74ea2122356efb1042759.view
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   67u      REG             253,10
>> >> 1818727
>> >>>>>> 1204247 /var/lib/db/couchdb/mapping_cache.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   78u      REG             253,10
>> >> 609905146
>> >>>>>> 1204234 /var/lib/db/couchdb/active_context.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   80u      REG             253,10
>> >> 545919085
>> >>>>>> 1994753 /var/lib/db/couchdb/active_context.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   81u      REG             253,10
>> >> 71032932
>> >>>>>> 1204249 /var/lib/db/couchdb/active_context_schedule.couch
(deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   84u      REG             253,10
>> >> 548866111
>> >>>>>> 1204239 /var/lib/db/couchdb/active_context.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   85u      REG             253,10
>> >> 564612402
>> >>>>>> 1204233 /var/lib/db/couchdb/active_context.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb   87u      REG             253,10
>> >> 615996179
>> >>>>>> 1204228 /var/lib/db/couchdb/active_context.couch (deleted)
>> >>>>>>
>> >>>>>> beam.smp  21352   couchdb  102u      REG             253,10
>> >> 561111149
>> >>>>>> 2023425 /var/lib/db/couchdb/active_context.couch (deleted)
>> >>>>>>
>> >>>>>>
>> >>>>>> Has anyone seen this behaviour before or knows of a way
around this
>> >> ?
>> >>>>>> Currently we have to restart the couchdb service in order
to
>> restore
>> >>>> the
>> >>>>>> disk space.
>> >>>>>>
>> >>>>>> Any help/advice is much appreciated.
>> >>>>>>
>> >>>>>> Regards
>> >>>>>>
>> >>>>>> Stephen
>> >>>>>>
>> >>>>>
>> >>>>
>> >>>
>> >>
>>
>>
>

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