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https://issues.apache.org/jira/browse/COUCHDB-465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Joseph Davis updated COUCHDB-465:
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Attachment: couch_uuids.patch
Refactored a bit.
couch_uuid_generator -> couch_uuids
sequential -> hybrid (this was mostly playing, thoughts?)
random is back to default and should stay that way
call to random:uniform() -> crypto:rand_uniform() (someone forgot to call
random:seed(), tsk tsk :)
[uuid_generator] -> [uuids] in config
added short description of choices next to option
probably an unneccessary optimization to allow for couch_uuids:new(N) to return
N ids.
added simple checks to the uuids.js Futon tests
Pulled in a contribution by Bob Dionne for etap tests.
All calls to couch_util:new_uuid() are replaced with couch_uuuids:random()
We should make the prefix length a configuration parameter I think.
We might also think about adding Brian's algorithm for more diversity as well.
> 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: 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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