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https://issues.apache.org/jira/browse/IGNITE-12438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17107988#comment-17107988
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Ivan Bessonov commented on IGNITE-12438:
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Hi [~dmagda],

I'll start the discussion soon. Feature is in experimental state in the code 
because it's still not clear how good this concept will be.

BTW, IGNITE-13013 isn't too clear for me - is it any different from the current 
task? Both require the same thing - providing the ability to have one-way 
connection from clients to servers, right?

> Extend communication protocol to establish client-server connection
> -------------------------------------------------------------------
>
>                 Key: IGNITE-12438
>                 URL: https://issues.apache.org/jira/browse/IGNITE-12438
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Alexey Goncharuk
>            Assignee: Ivan Bessonov
>            Priority: Major
>             Fix For: 2.9
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> Recently there was quite a lot of questions related to thick clients 
> connectivity issues when the clients are deployed in a k8s pod [1]. The 
> general issue here is clients reporting network address which are not 
> reachable from server nodes. At the same time, the clients can connect to 
> server nodes.
> An idea of how to fix this is as follows:
>  * Make sure that think clients discovery SPI always maintains a connection 
> to a server node (this should be already implemented)
>  * (Optionally) detect when a client has only one-way connectivity with the 
> server nodes. This part should be investigated. We need this to avoid server 
> nodes attempt to connect to a client and send communication request to the 
> client node faster
>  * When a server attempts to establish a connection with a client, check if 
> client is unreachable or the previous connection attempt failed. If so, send 
> a discovery message to the client to force a client-server connection. In 
> this case, server will be able to send the original message via the newly 
> established connection.
> [1] 
> https://stackoverflow.com/questions/59192075/ignite-communicationspi-questions-in-paas-environment/59232504



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