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https://issues.apache.org/jira/browse/COUCHDB-926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925295#action_12925295
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Russell van der Walt commented on COUCHDB-926:
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Sorry, I just realized I didn't actually answer your last question.
Having dug around a bit more, I can confirm that it only if the view file is
open.
If you compact the database without opening the database after a restart, no
problem.
If you compact the database after opening it, but not querying any of the
views, no problem.
If however you compact after querying a view, file handles are left behind.
If appears that both views and database files are left behind:
Before compaction:
r...@ubuntu904:~# lsof | grep -P 'COMMAND|/var/data/couchdb/'
COMMAND PID USER FD TYPE DEVICE SIZE
NODE NAME
beam 22022 root 13u REG 252,0 4185
3653752 /var/data/couchdb/_users.couch
beam 22022 root 20u REG 252,0 18128988
3653679 /var/data/couchdb/storage-test.couch
beam 22022 root 21u REG 252,0 12377
3884278
/var/data/couchdb/.storage-test_design/800b1d5fe6334f272f2a8ad9feb9e0d9.view
After compaction:
r...@ubuntu904:~# lsof | grep -P 'COMMAND|/var/data/couchdb/'
COMMAND PID USER FD TYPE DEVICE SIZE
NODE NAME
beam 22022 root 13u REG 252,0 4185
3653752 /var/data/couchdb/_users.couch
beam 22022 root 20u REG 252,0 18128988
3653679 /var/data/couchdb/.delete/3d7816bb09602b0ac9092e1d9fba9172 (deleted)
beam 22022 root 21u REG 252,0 12377
3884278 /var/data/couchdb/.delete/cb1436e9818a0fde236d7e130cf02fbe (deleted)
beam 22022 root 23u REG 252,0 4185
3884279
/var/data/couchdb/.storage-test_design/800b1d5fe6334f272f2a8ad9feb9e0d9.view
beam 22022 root 25u REG 252,0 32860
3654908 /var/data/couchdb/storage-test.couch
> Compaction does not release file descriptors
> --------------------------------------------
>
> Key: COUCHDB-926
> URL: https://issues.apache.org/jira/browse/COUCHDB-926
> Project: CouchDB
> Issue Type: Bug
> Components: Database Core
> Affects Versions: 1.0.1
> Environment: Ubuntu 9.04/10.4
> Reporter: Russell van der Walt
> Fix For: 1.0.2, 1.1
>
>
> When couch compacts a database, file descriptors of the deleted files are
> left open, causing the freed disk space to not be released to the system.
> With regular compaction, the system eventually runs out of disk space.
> There is a conversation thread in the user mailing list titled "Couch not
> releasing deleted files" that gives more insight into the problem, but I have
> been unable to find a bug report for it, so please accept my apologies if
> this has already been dealt with.
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