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From "Ivan Pavlukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-9322) MVCC: implement deadlock detector
Date Wed, 19 Dec 2018 08:53:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-9322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16724806#comment-16724806
] 

Ivan Pavlukhin commented on IGNITE-9322:
----------------------------------------

[~gvvinblade], Do you have some suggestion to improve searching for a transaction object by
MVCC version and searching for a waiting transaction blocker? Currently it is done quite naively.

> MVCC: implement deadlock detector
> ---------------------------------
>
>                 Key: IGNITE-9322
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9322
>             Project: Ignite
>          Issue Type: Task
>          Components: mvcc
>            Reporter: Vladimir Ozerov
>            Assignee: Ivan Pavlukhin
>            Priority: Major
>              Labels: MakeTeamcityGreenAgain
>
> Deadlocks are not uncommon during SQL execution.
> We need to implement distributed deadlock detection protocol for MVCC. Essentially, nodes
should exchange some map of tx wait lists, and try to find a loop. If loop is found, then
one of problematic transactions should be rolled back.



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