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From "Mason Wolf (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-2472) Add support for atomic counters on cluster solutions
Date Tue, 15 Dec 2015 17:54:46 GMT

    [ https://issues.apache.org/jira/browse/OAK-2472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15058425#comment-15058425
] 

Mason Wolf commented on OAK-2472:
---------------------------------

If you look at the attached spec from OAK-2220 (see https://issues.apache.org/jira/secure/attachment/12693084/oak-atomic-counter.md)
it specifically mentions fields like ":oak-counter-uuid1" so that you can have many increments
at one time.

That said, if thread1 sets oak:increment to 1 and thread2 simultaneously sets oak:increment
to 2, then regardless of which order they actually commit in, since oak:increment is never
actually saved, but just used to update oak:counter, I think the result will always be oak:counter+=3.
Before your atomic counter was provided, the final version of our counted field would either
be +1 or +2 depending on the order of the commit.

For non-clustered environments, I think this is sufficient, Laurie.

If the same code I wrote based on OAK-2220 will be sufficient once OAK-2472 is finished, then
I'm done on my end, and thank you.

> Add support for atomic counters on cluster solutions
> ----------------------------------------------------
>
>                 Key: OAK-2472
>                 URL: https://issues.apache.org/jira/browse/OAK-2472
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.3.0
>            Reporter: Davide Giannella
>            Assignee: Davide Giannella
>              Labels: scalability
>             Fix For: 1.4
>
>         Attachments: atomic-counter.md
>
>
> As of OAK-2220 we added support for atomic counters in a non-clustered situation. 
> This ticket is about covering the clustered ones.



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