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https://issues.apache.org/jira/browse/COUCHDB-1667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571508#comment-13571508
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Jan Lehnardt commented on COUCHDB-1667:
---------------------------------------

Ah yes, the alternative is to put cleverness into code, but in the grander 
scheme of things, whether the base directory for indexes is called 
view_index_dir or index_dir does *not* make a huge difference, so I thought we 
skip being smart and stick with the old name. With 1.3.x and later indexes will 
be separated by index module anyway ([view_]index_dir/mrview, /geocouch etc), 
so I don’t think we gain much by renaming things.
                
> Gracefully update from view_index_dir to index_dir
> --------------------------------------------------
>
>                 Key: COUCHDB-1667
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1667
>             Project: CouchDB
>          Issue Type: Bug
>    Affects Versions: 1.3
>            Reporter: Alexander Shorin
>            Priority: Blocker
>         Attachments: COUCHDB-1667.1-revert_to_view_index_dir.patch, 
> COUCHDB-1667.1-update_to_index_dir.patch
>
>
> CouchDB 1.3 ships with new couch_index app[1] that uses `index_dir` config 
> option to locate directory to store view indexes. However, it replaces[2] old 
> `view_index_dir`option creating situation when recently updated default.ini 
> will have only `index_dir` option and old, but production used local.ini 
> would still have `view_index_dir`. There is a fallback[3], but there no 
> insurance that it will let user gracefully update.
> This situation may leads to very bad situations, when all indexes will be 
> rebuilded against location that may not expects their on disk size (since 
> `view_index_dir` was pointed to the another mount point) which leads to 
> server fall.
> [1]: https://git-wip-us.apache.org/repos/asf?p=couchdb.git;a=commit;h=35e57870
> [2]: https://git-wip-us.apache.org/repos/asf?p=couchdb.git;a=commit;h=e83352f3
> [3]: 
> https://github.com/apache/couchdb/blob/master/src/couch_index/src/couch_index_util.erl#L22

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