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From Juan Jose Comellas <jua...@comellas.org>
Subject Re: Couch not releasing deleted files
Date Tue, 14 Sep 2010 01:25:09 GMT
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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