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From "Roman Kondakov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-10047) MVCC: Wrong coordinator assignment when two oldest nodes fail.
Date Sat, 10 Nov 2018 15:59:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-10047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16682482#comment-16682482
] 

Roman Kondakov commented on IGNITE-10047:
-----------------------------------------

[~vozerov], [~gvvinblade], patch is ready for review. Tests look good.

> MVCC: Wrong coordinator assignment when two oldest nodes fail.
> --------------------------------------------------------------
>
>                 Key: IGNITE-10047
>                 URL: https://issues.apache.org/jira/browse/IGNITE-10047
>             Project: Ignite
>          Issue Type: Bug
>          Components: mvcc
>            Reporter: Roman Kondakov
>            Assignee: Roman Kondakov
>            Priority: Major
>             Fix For: 2.8
>
>
> Reproducer: {{CacheContinuousQueryFailoverMvccTxSelfTest#testLeftPrimaryAndBackupNodes}}.
This test can sporadically hangs when topology is unstable.
> The problem here is when two oldest nodes A and B failed, other nodes elect B node as
a new coordinator despite it is down. This happens because the new mvcc coordinator is assigned
in  {{GridDhtPartitionsExchangeFuture#init}} method which is called only ones in case of multiple
nodes fail simultaneously. 



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