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Posted to issues@ignite.apache.org by "Dmitriy Govorukhin (JIRA)" <ji...@apache.org> on 2016/12/15 07:56:58 UTC
[jira] [Commented] (IGNITE-1678) IgniteAtomicSequence: make
following reservations in advance
[ https://issues.apache.org/jira/browse/IGNITE-1678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15750704#comment-15750704 ]
Dmitriy Govorukhin commented on IGNITE-1678:
--------------------------------------------
I got the following results, see attach.
> 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: 2.0
>
> Attachments: Screenshot from 2016-12-15 10-50-22.png
>
>
> 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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