[jira] [Updated] (IGNITE-20852) Connection attempt clinches may cause connection failure

["Roman Puchkovskiy (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-20852?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Roman Puchkovskiy updated IGNITE-20852:
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    Summary: Connection attempt clinches may cause connection failure  (was: Connection attempt clinches may case connection failure)

> Connection attempt clinches may cause connection failure
> --------------------------------------------------------
>
>                 Key: IGNITE-20852
>                 URL: https://issues.apache.org/jira/browse/IGNITE-20852
>             Project: Ignite
>          Issue Type: Bug
>            Reporter: Roman Puchkovskiy
>            Assignee: Roman Puchkovskiy
>            Priority: Major
>              Labels: ignite-3
>             Fix For: 3.0.0-beta2
>
>
> A clinch is a situation when two nodes (A and B) try to establish logical connections to each other at the same time. Only one of the connections can remain, so another one is aborted. When such an abortion happens, the client that initiated the aborted physical connection must be transparently switched to the connection opened 'from the other side'.
> Instead, in most of the clinches, MessagingService gets an exception as a result of the clinch resolution on one of the sides. We must avoid this.
> Another problem is that the clinch resulution protocol sometimes kills an 'almost established connection' (or even a fully estabished connection) [that has managed to aquire recovery descriptors on both sides] just because another connection (that has just failed to aquire first recovery descriptor) is preferred by the tie-breaker. The tie-breaker must only be used in true clinch situations (each of the competitors have 1 descriptor aquired).



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