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From "Robert Newson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (COUCHDB-390) proposed additions to _changes feed
Date Tue, 07 Jul 2009 09:37:15 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728008#action_12728008
] 

Robert Newson commented on COUCHDB-390:
---------------------------------------


To me, the per-db feature of _changes is useful for applications themselves, to refresh a
display with a new post or something. For everything else, including replication, a global
stream with a user-supplied filter function seems better.

> proposed additions to _changes feed
> -----------------------------------
>
>                 Key: COUCHDB-390
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-390
>             Project: CouchDB
>          Issue Type: New Feature
>            Reporter: eric casteleijn
>
> The _changes comet feed as a replacement for the update notifications is a great step
forward, but I'm currently missing these features:
> 1. The feeds are now per database, rather than per server, which is nice in some use
cases, but in others it's preferable to have a server wide feed (In the case of many thousands
of databases on a server, and a single process reacting to updates, by putting messages on
a message queue for instance). Ideally I'd like to have both server wide and per database
_changes feeds available.
> 2. I'd like to have a configurable _changes feed that let's me declare what data will
be output in the update rows in the feed, in a similar way to writing views.
> 3. I'd like to (optionally) have information on whether a particular update was a document
creation, update or deletion, so clients would be able to react to those differently without
needing to query into the database to find out what happened. 

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