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https://issues.apache.org/jira/browse/COUCHDB-1652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14389403#comment-14389403
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Robert Newson commented on COUCHDB-1652:
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Hi,
This could be erlang. We (Cloudant) know that R14B01 has a rare bug wherein
close a file does not cause the vm to release the file descriptor. Over time
these accumulate. If that's the cause here, the only solution is to restart the
service or upgrade your erlang version.
> CouchDB does not release disk space from .deleted files
> -------------------------------------------------------
>
> Key: COUCHDB-1652
> URL: https://issues.apache.org/jira/browse/COUCHDB-1652
> Project: CouchDB
> Issue Type: Bug
> Components: Database Core
> Affects Versions: 1.2
> Environment: Ubuntu 8.04, 10.04, 12.04 , CouchDB 1.2.0, CouchDB
> 1.2.1, Erlang 14b4 64bit platform
> Reporter: Simon Eisenmann
> Assignee: Randall Leeds
>
> I noticed on long running servers a disk space increase over time. Though the
> database in itself did not grow. After investigation i found that there are
> lots of files still open which have already been deleted.
> I see this on all installations on Ubuntu 8.04, 10.04 and 12.04 all 64bit
> with CouchDB 1.2.0 and 1.2.1 with Erlang 14b4.
> lsof |grep deleted
> beam.smp 4845 couchdb 24u REG 254,1 5890159
> 171082
> /var/lib/couchdb/.delete/582878aeee568e3c06dc3262fdac494b (deleted)
> beam.smp 4845 couchdb 25u REG 254,1 5890159
> 171080
> /var/lib/couchdb/.delete/95b92c25e3d7ea2f2045a2ee37afd8fe (deleted)
> beam.smp 4845 couchdb 26u REG 254,1 5890183
> 171081
> /var/lib/couchdb/.delete/bb616c2baae507b7ec890451650e40c9 (deleted)
> beam.smp 4845 couchdb 27u REG 254,1 5890159
> 244324
> /var/lib/couchdb/.delete/f7a4ba016d098c34f1ff97ca61a824f8 (deleted)
> beam.smp 4845 couchdb 28u REG 254,1 5890159
> 171196
> CouchDB should release the file pointer on those files, to release the disk
> space to tools like df.
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