[jira] [Commented] (COUCHDB-3315) Introduce randomness to initial revisions of docs

["Joan Touzet (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/COUCHDB-3315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15928437#comment-15928437 ] 

Joan Touzet commented on COUCHDB-3315:
--------------------------------------

If you're coming to this ticket without context, you probably want to read the comment thread on COUCHDB-3314 as well.

> Introduce randomness to initial revisions of docs
> -------------------------------------------------
>
>                 Key: COUCHDB-3315
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-3315
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Database Core
>            Reporter: Mayya Sharipova
>             Fix For: 3.0.0
>
>
> This ticket is for couch 3.0 to add randomness to the initial revision of any doc with an option to specify that random value in the API by a user.
> While a goal for COUCHDB-3314 is to allow a user to supply a random initial revision for a doc through API when desired and if not supplied a deterministic {0, <<>>} will be used for all docs;  the goal of this ticket is to make initial revisions of all docs to be random. This is done to account for situations when a document is continually purged and recreated.
> This change does affect one specific behavior. Any user that currently sends identical writes to two independent databases and then replicates between those databases would see conflicts whenever they create a new database. The downside of this change is that there's a use case where someone may make the same exact writes to two or more databases and expect there to be no conflicts due to replication.
> It is important to note that the 0-$rev only affects document creation. Once
> a document exists, updates to the document will continue to update their hash in the same deterministic fashion. Ie, once a document exists, identical
> updates will result in identical revisions.
> ________________
> Changes to code:
> Swap the logic in new_revid to produce random revisions for the initial creation
>  {0, <<>>} which it is now, we'll replace it with randomness the <<>> binary bit



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