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https://issues.apache.org/jira/browse/IGNITE-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15948419#comment-15948419
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Denis Magda commented on IGNITE-4587:
-------------------------------------

[~dreamx], [~agura],

Looking at the benchmarking results produced by one of my colleagues I didn't 
spot any performance degradation between 1.9 and 2.0 for PRIMARY write order 
mode. So, we accept this contribution and wipe out {{CLOCK}} mode.

Even more, can we remove {{CacheAtomicWriteOrderMode}} enum from the public API 
at all? I see no reason why we should preserve for a single option available - 
{{PRIMARY}}. Asked the same in the related discussion on the dev list.

> Discontinue and remove CacheAtomicWriteOrderMode.CLOCK mode
> -----------------------------------------------------------
>
>                 Key: IGNITE-4587
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4587
>             Project: Ignite
>          Issue Type: Bug
>          Components: cache
>            Reporter: Denis Magda
>            Assignee: Maksim Kozlov
>             Fix For: 2.0
>
>
> {{CacheAtomicWriteOrderMode.CLOCK}} proved to be harmful in production due to 
> timing issues.
> It makes sense to remove it completely in 2.0 release. Migration guide has be 
> updated:
> https://cwiki.apache.org/confluence/display/IGNITE/Apache+Ignite+2.0+Migration+Guide



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