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From "Paul Joseph Davis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1309) File descriptor leaks on design document update and view cleanup
Date Thu, 20 Oct 2011 19:51:13 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13131954#comment-13131954
] 

Paul Joseph Davis commented on COUCHDB-1309:
--------------------------------------------

I've been thinking about this and it occurs to me that adding the new function to the index
seems like the wrong way to go about this. Seems to me that couch_index_server and couch_index
should take care of all of this without requiring each index to reimplement this simple code.
I'll take a quick pass through later to try and sketch out what i mean.
                
> File descriptor leaks on design document update and view cleanup
> ----------------------------------------------------------------
>
>                 Key: COUCHDB-1309
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1309
>             Project: CouchDB
>          Issue Type: Bug
>            Reporter: Filipe Manana
>            Assignee: Filipe Manana
>         Attachments: couchdb-1309_12x.patch, couchdb-1309_trunk.patch
>
>
> If we add a design document with views defined in it, open the corresponding view group
(by querying one of its views for e.g.), then update the design document in such a way that
the view signature changes (changing a view's map function code for e.g), the old view group
remains open forever (unless a server restart happens) and keeps it's view file reference
counter active forever.
> If a view cleanup request comes, the old view file is not deleted since the reference
counter is not dropped by the old view group, keeping the file descriptor in use forever.
> This leakage is different from what is reported in COUCHDB-1129 but it's somehow related.
> The attached patch, simply shutdowns a view group when the design document is updated
and the new view signature changes, releasing the old view file descriptor (as soon as no
more clients are using the old view).

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