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From "Dave Cottlehuber (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1441) _rewrite handler loops cause cpu load and swap of death
Date Thu, 15 Mar 2012 20:52:37 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230530#comment-13230530
] 

Dave Cottlehuber commented on COUCHDB-1441:
-------------------------------------------

Thanks Ronny for raising this!

I don't see how we could deterministically detect this prior to storing the updated ddoc (halting
pb).
The question then is can the rewriter track number of traverses and eventually die?
Or do we mark as DNF and note in the appropriate place that you can easily shoot yourself
in the foot here?
                
> _rewrite handler loops cause cpu load and swap of death
> -------------------------------------------------------
>
>                 Key: COUCHDB-1441
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1441
>             Project: CouchDB
>          Issue Type: Bug
>          Components: HTTP Interface
>         Environment: debian testing
>            Reporter: Ronny Pfannschmidt
>
> when creating a simple _rewrite loop, the db will start to eat cpu and take more &
more memory
> for testing i created:
> {"_id":"_design/loopa","rewrites":[{"from":"","to":"../loopb/_rewrite"}]}
> {"_id":"_design/loopb","rewrites":[{"from":"","to":"../loopa/_rewrite"}]}
> accessing $dburi/_design/loopa/_rewrite/ will start the loop

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