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From "Dmitry Karachentsev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-6818) In case of incoming communication connection ping the old one if it's alive
Date Fri, 10 Nov 2017 12:40:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-6818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16247422#comment-16247422
] 

Dmitry Karachentsev commented on IGNITE-6818:
---------------------------------------------

[~sboikov] please review.

Thanks!

> In case of incoming communication connection ping the old one if it's alive
> ---------------------------------------------------------------------------
>
>                 Key: IGNITE-6818
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6818
>             Project: Ignite
>          Issue Type: Bug
>      Security Level: Public(Viewable by anyone) 
>    Affects Versions: 2.3
>            Reporter: Dmitry Karachentsev
>            Assignee: Dmitry Karachentsev
>            Priority: Critical
>             Fix For: 2.4
>
>
> Assume the following scenario:
> 1. Client opens connection to the server.
> 2. Server checks that it is a first connection to that node and accepts it.
> 3. By some reason firewall starts rejecting client messages with TCP reset flag set.
> 4. Client closes connection, but server doesn't know about it.
> 5. Client tries connect again.
> 6. Server rejects new connection, because it already has connection to that node.
> Possible fix: on step 6 server must check old connection if it's alive by sending some
communication message and check response. If old connection is dead - close it and accept
new one.



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