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From "Ivan Pavlukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-7955) MVCC TX: cache peek for key-value API
Date Wed, 07 Nov 2018 09:54:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-7955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16677934#comment-16677934
] 

Ivan Pavlukhin commented on IGNITE-7955:
----------------------------------------

A peek operation for MVCC caches is implemented as read operation with a special snapshot
which sees all committed versions (coordinator and counter are set to maximum, empty active
transactions list). It allows retrieving latest committed version for any key.
Useful detail: _operation counter_ component in mvcc version might contain hint bits allowing
to know that version was committed without asking TxLog.

> MVCC TX: cache peek for key-value API
> -------------------------------------
>
>                 Key: IGNITE-7955
>                 URL: https://issues.apache.org/jira/browse/IGNITE-7955
>             Project: Ignite
>          Issue Type: Task
>          Components: cache, mvcc
>            Reporter: Alexander Paschenko
>            Assignee: Ivan Pavlukhin
>            Priority: Major
>             Fix For: 2.8
>
>
> We need to implement MVCC-compatible cache peekĀ operation for key-value API.



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