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Posted to dev@couchdb.apache.org by "Ronny Pfannschmidt (Created) (JIRA)" <ji...@apache.org> on 2012/03/15 20:24:37 UTC
[jira] [Created] (COUCHDB-1441) _rewrite handler loops cause cpu
load and swap of death
_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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[jira] [Commented] (COUCHDB-1441) _rewrite handler loops cause cpu
load and swap of death
Posted by "Dave Cottlehuber (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230531#comment-13230531 ]
Dave Cottlehuber commented on COUCHDB-1441:
-------------------------------------------
should have added that this requires admin access to DB or server to do this, its not a DoS opportunity. More like "rm -rf may cause premature data & job loss".
> _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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[jira] [Resolved] (COUCHDB-1441) _rewrite handler loops cause cpu
load and swap of death
Posted by "Alexander Shorin (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alexander Shorin resolved COUCHDB-1441.
---------------------------------------
Resolution: Fixed
Fix Version/s: 1.3
1.2.1
Already fixed for 1.3: https://git-wip-us.apache.org/repos/asf?p=couchdb.git;a=commit;h=d076976c
and for 1.2.1: https://git-wip-us.apache.org/repos/asf?p=couchdb.git;a=commit;h=30334ac8
> _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
> Fix For: 1.2.1, 1.3
>
>
> 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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[jira] [Commented] (COUCHDB-1441) _rewrite handler loops cause cpu
load and swap of death
Posted by "Dave Cottlehuber (Commented) (JIRA)" <ji...@apache.org>.
[ 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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[jira] [Commented] (COUCHDB-1441) _rewrite handler loops cause cpu
load and swap of death
Posted by "Ronny Pfannschmidt (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230723#comment-13230723 ]
Ronny Pfannschmidt commented on COUCHDB-1441:
---------------------------------------------
a reasonable way to implement this might be to add a counter when rewriting the mochiweb headers in the _rewrite handler
> _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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