couchdb-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Robert Newson (JIRA)" <j...@apache.org>
Subject [jira] Updated: (COUCHDB-465) Produce sequential, but unique, document id's
Date Tue, 18 Aug 2009 10:34:14 GMT

     [ https://issues.apache.org/jira/browse/COUCHDB-465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Newson updated COUCHDB-465:
----------------------------------

    Attachment:     (was: sequence_id.patch)

> Produce sequential, but unique, document id's
> ---------------------------------------------
>
>                 Key: COUCHDB-465
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-465
>             Project: CouchDB
>          Issue Type: Improvement
>            Reporter: Robert Newson
>         Attachments: uuid_generator.patch, uuid_generator.patch
>
>
> Currently, if the client does not specify an id (POST'ing a single document or using
_bulk_docs) a random 16 byte value is created. This kind of key is particularly brutal on
b+tree updates and the append-only nature of couchdb files.
> Attached is a patch to change this to a two-part identifier. The first part is a random
12 byte value and the remainder is a counter. The random prefix is rerandomized when the counter
reaches its maximum. The rollover in the patch is at 16 million but can obviously be changed.
The upshot is that the b+tree is updated in a better fashion, which should lead to performance
benefits.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message