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Posted to issues@ignite.apache.org by "Vladimir Ozerov (JIRA)" <ji...@apache.org> on 2019/03/11 07:30:00 UTC

[jira] [Updated] (IGNITE-9591) MVCC: Do small write operations under the read lock.

     [ https://issues.apache.org/jira/browse/IGNITE-9591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov updated IGNITE-9591:
------------------------------------
    Labels: mvcc_performance performance  (was: performance)

> MVCC: Do small write operations under the read lock.
> ----------------------------------------------------
>
>                 Key: IGNITE-9591
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9591
>             Project: Ignite
>          Issue Type: Improvement
>          Components: mvcc
>            Reporter: Roman Kondakov
>            Priority: Minor
>              Labels: mvcc_performance, performance
>
> There are several operations in MVCC flow which can be done under the page read lock instead of write lock. For example, setting xid_max on a datarow. It is safe, because races are possible only between concurrent transactions, which are not visible to each other. 
> See {{MvccMarkUpdatedHandler}} and other similar handlers in this class.



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