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https://issues.apache.org/jira/browse/COUCHDB-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12873462#action_12873462
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Filipe Manana commented on COUCHDB-753:
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I just implemented a solution where:
- when creating a new DB, couch_server will select one directory in a
round-robin fashion
- when compacting a DB, one of the directories is also selected in a
round-robin fashion to store the compaction file
- when compaction finishes, the new DB file is not moved from one directory to
another (avoiding expensive IO)
For example, if we have 2 DB dirs and we create 6 DBs, each DB dir will have 3
DBs. This is great if each directory maps to a different IO device.
The code is at http://github.com/fdmanana/couchdb/compare/multiple_db_dirs
It includes a comprehensive Etap test case.
I'll attach a patch here if I get positive feedback.
If there's no objection to this approach, I'll do the same but for supporting
multiple view index directories. Although this makes sense to go into a
separate patch.
> Add config option for view compact dir
> --------------------------------------
>
> Key: COUCHDB-753
> URL: https://issues.apache.org/jira/browse/COUCHDB-753
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Reporter: Till Klampaeckel
>
> CouchDB creates a "foo.view.compact" file in the view directory
> ("view_index_dir") when you run compact against a view.
> I'd really like to be able to specify another directory where this ".compact"
> file is created and worked on. This is especially helpful when it's difficult
> to run compaction because you run out of disk space on the same device.
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