[jira] Commented: (COUCHDB-892) Method for restarting filtered replication

["Filipe Manana (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/COUCHDB-892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12914801#action_12914801 ] 

Filipe Manana commented on COUCHDB-892:
---------------------------------------

Adding the start_seq field to a replication object is the simplest way of doing it.

Otherwise the replicator must use the entire string of the filter function (which resides in a design doc  of the source DB) as part of the input to the MD5 function used to calculate the replication ID.

Please, give your opinions.

> Method for restarting filtered replication
> ------------------------------------------
>
>                 Key: COUCHDB-892
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-892
>             Project: CouchDB
>          Issue Type: New Feature
>          Components: Replication
>            Reporter: Marco Monteiro
>            Assignee: Filipe Manana
>            Priority: Minor
>
> I'm using filtered replication to maitain a database that has a subset of the documents of some other database.
> The problem I have is when I change the filter. If the filter allows for more documents to be replicated, those that
> were created before the last replication are not replicated. So, I have to remove the database and recreate it.
> I see two solutions that can be implemented to help in this situation. The first one is for the filtered replication
> to restart whenever the filter changes (maybe also adding an argument to replicate to tell that" we want this to happen).
> Another solution is to add an argument to replicate ("start_seq", as sugested by fdmanana on IRC) that would be the 
> source database ""local_seq that we want the replication to start from. This an be set to 1 to restart from first change.

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