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From Stefan Kögl (JIRA) <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1769) Duplicates in View indexes
Date Tue, 28 May 2013 18:50:21 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13668549#comment-13668549
] 

Stefan Kögl commented on COUCHDB-1769:
--------------------------------------

I've investigated this a bit further. One of the design document for which compaction keeps
failing with duplicates has [6 views|https://github.com/gpodder/mygpo/tree/9c4ff38f6b432ed75264b8b86973043e2b4fbced/couchdb/general/_design/listeners/views].
I've ran the document {{05033b78521e97e9cfb06a4bce8c28f7}} through all of their map functions
and none of them did emit any value. I don't know if this is relevant, though.

The smallest .view file with duplicates is 944M in size, and I could share it with one of
the developers if somebody is interested.
                
> Duplicates in View indexes
> --------------------------
>
>                 Key: COUCHDB-1769
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1769
>             Project: CouchDB
>          Issue Type: Bug
>          Components: JavaScript View Server
>    Affects Versions: 1.3
>            Reporter: Stefan Kögl
>         Attachments: duplicate.log
>
>
> The compaction of a view (created with CouchDB 1.3) failed due to view_duplicate_id.
The database to which the view belongs was created with 1.2.x but compacted (with the 0-byte-compact-file
trick) with 1.3.
> A full log of the failed compaction can be found at
> https://friendpaste.com/1AL050bzwyLCa9KJUKJw1u
> I experienced the same behaviour already with previous versions but assumed it might
be gone with 1.3, but this seems not to be the case. 
> When such duplicates happen (and appear during compaction), they seem to be at the beginning
of the view index. The view in question has the following _info:
> {noformat}
> {"name":"listeners","view_index":{"signature":"854a8065b438b3e53fcdbbe0a79a8e80","language":"javascript","disk_size":2679632207,"data_size":1026614011,"update_seq":58353111,"purge_seq":0,"updater_running":false,"compact_running":false,"waiting_commit":false,"waiting_clients":0}}
> {noformat}
> Compaction stopped with a 39M large .compact.view file.
> Also the problem seems to happen only one some machines.

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