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From "Dmitriy Govorukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-1678) IgniteAtomicSequence: make following reservations in advance
Date Tue, 13 Sep 2016 15:05:21 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-1678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15487453#comment-15487453
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Dmitriy Govorukhin commented on IGNITE-1678:
--------------------------------------------

Hi [~sboikov], I corrected comments, move all code in one branch (ignite-1678-2). Also added
benchmark. 

> IgniteAtomicSequence: make following reservations in advance
> ------------------------------------------------------------
>
>                 Key: IGNITE-1678
>                 URL: https://issues.apache.org/jira/browse/IGNITE-1678
>             Project: Ignite
>          Issue Type: Improvement
>          Components: data structures
>    Affects Versions: ignite-1.4
>            Reporter: Denis Magda
>            Assignee: Dmitriy Govorukhin
>             Fix For: 1.8
>
>
> In current implementation a new reservation is made when the current local sequence boundary
is exceeded.
> In cases when there are many nodes that use the same atomic sequence there can be a situation
when all the nodes start doing a new reservation at the same time. This can lead to performance
drops.
> As a performance optimization it makes sense to start reserving new sequence slot in
advance (in background), like when around 80% of current reservation has already been used.
Probably we should add a special parameter to {{AtomicConfiguration}} that will manage such
behavior.



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