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From "Jan Lehnardt (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1667) Gracefully update from view_index_dir to index_dir
Date Tue, 05 Feb 2013 17:52:11 GMT

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

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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