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From "Alexander Shorin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1345) Bulk edit document on the server
Date Mon, 01 Jul 2013 11:52:20 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13696762#comment-13696762
] 

Alexander Shorin commented on COUCHDB-1345:
-------------------------------------------

This idea is implemented in [couch_normalizer|https://github.com/datahogs/couch_normalizer]
project which acts as CouchDB plugin.
                
> Bulk edit document on the server
> --------------------------------
>
>                 Key: COUCHDB-1345
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1345
>             Project: CouchDB
>          Issue Type: Wish
>            Reporter: Jan Lehnardt
>
> [moved here from the wiki]
> A Document Runner would provide functionality to run a transform function across all
documents in the database. This way you could do maintenance and migrations, with incurring
a bunch of http overhead.
> The idea was originally floated on the couchdb-user mailing list.
> Requirements
> Ability to specify a job in a view-server like context (Javascript other language function)
and have it run across all docs (like a view is), but with the additional ability to write
back to the document (through the http api, so we don't have to add a socket-based update
interface).
> Caveat:
> We may not be able to guarantee that runner functions see each document only once, so
functions need to be aware only to modify documents that require modification.
> Uses
> Changing the format of a timestamp across all docs
> Removing sensitive fields before replicating to another jurisdiction
> (View runner... slightly different) Materializing the results of group=true reduce queries
into a dataset for further map/reduce processing (a common pattern in Hadoop)

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