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From Robert Newson <robert.new...@gmail.com>
Subject Re: [jira] Updated: (COUCHDB-465) Produce sequential, but unique, document id's
Date Wed, 09 Sep 2009 16:30:02 GMT
Since the default is staying with random, I see no reason not to
commit it today :)

B.

On Wed, Sep 9, 2009 at 5:21 PM, Adam Kocoloski (JIRA)<jira@apache.org> wrote:
>
>     [ https://issues.apache.org/jira/browse/COUCHDB-465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
>
> Adam Kocoloski updated COUCHDB-465:
> -----------------------------------
>
>    Fix Version/s: 0.11
>
> Yes, this is going into 0.11.  It looks like things have stabilized; is there any reason
not to commit it today?
>
>> 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
>>             Fix For: 0.11
>>
>>         Attachments: 041-uuid-gen-seq.ini, 041-uuid-gen-utc.ini, 041-uuid-gen.t,
couch_uuids.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.
>
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>

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