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From Robert Dionne <dio...@dionne-associates.com>
Subject Re: [jira] Updated: (COUCHDB-968) Duplicated IDs in _all_docs
Date Sat, 27 Nov 2010 23:36:21 GMT
yea, they are identical and both compaction and exceeding the revision max is required to reproduce.



On Nov 27, 2010, at 5:45 PM, Adam Kocoloski (JIRA) wrote:

> 
>     [ https://issues.apache.org/jira/browse/COUCHDB-968?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
> 
> Adam Kocoloski updated COUCHDB-968:
> -----------------------------------
> 
>    Priority: Blocker  (was: Major)
> 
> Bob, in tisba's case the duplicates had the same revision.  Is that also true in your
case?  And you only see these duplicates after compaction?
> 
>> Duplicated IDs in _all_docs
>> ---------------------------
>> 
>>                Key: COUCHDB-968
>>                URL: https://issues.apache.org/jira/browse/COUCHDB-968
>>            Project: CouchDB
>>         Issue Type: Bug
>>         Components: Database Core
>>   Affects Versions: 1.0, 1.0.1, 1.0.2
>>        Environment: Ubuntu 10.04.
>>           Reporter: Sebastian Cohnen
>>           Priority: Blocker
>> 
>> We have a database, which is causing serious trouble with compaction and replication
(huge memory and cpu usage, often causing couchdb to crash b/c all system memory is exhausted).
Yesterday we discovered that db/_all_docs is reporting duplicated IDs (see [1]). Until a few
minutes ago we thought that there are only few duplicates but today I took a closer look and
I found 10 IDs which sum up to a total of 922 duplicates. Some of them have only 1 duplicate,
others have hundreds.
>> Some facts about the database in question:
>> * ~13k documents, with 3-5k revs each
>> * all duplicated documents are in conflict (with 1 up to 14 conflicts)
>> * compaction is run on a daily bases
>> * several thousands updates per hour
>> * multi-master setup with pull replication from each other
>> * delayed_commits=false on all nodes
>> * used couchdb versions 1.0.0 and 1.0.x (*)
>> Unfortunately the database's contents are confidential and I'm not allowed to publish
it.
>> [1]: Part of http://localhost:5984/DBNAME/_all_docs
>> ...
>> {"id":"9997","key":"9997","value":{"rev":"6096-603c68c1fa90ac3f56cf53771337ac9f"}},
>> {"id":"9999","key":"9999","value":{"rev":"6097-3c873ccf6875ff3c4e2c6fa264c6a180"}},
>> {"id":"9999","key":"9999","value":{"rev":"6097-3c873ccf6875ff3c4e2c6fa264c6a180"}},
>> ...
>> [*]
>> There were two (old) servers (1.0.0) in production (already having the replication
and compaction issues). Then two servers (1.0.x) were added and replication was set up to
bring them in sync with the old production servers since the two new servers were meant to
replace the old ones (to update node.js application code among other things).
> 
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