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From Apache Wiki <wikidi...@apache.org>
Subject [Couchdb Wiki] Update of "DocumentRunnerPlugin" by JoanTouzet
Date Fri, 13 Apr 2018 05:59:29 GMT
Dear wiki user,

You have subscribed to a wiki page "Couchdb Wiki" for change notification.

The page "DocumentRunnerPlugin" has been deleted by JoanTouzet:

https://wiki.apache.org/couchdb/DocumentRunnerPlugin?action=diff&rev1=3&rev2=4

Comment:
Good future-looking idea, but it's never been implemented.

- #redirect Document_runner_plugin
- 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 [[http://mail-archives.apache.org/mod_mbox/incubator-couchdb-user/200806.mbox/%3ce282921e0806130216w3d20dfdfh244ea5b491e12ee5@mail.gmail.com%3e|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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