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https://issues.apache.org/jira/browse/IGNITE-3152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15339719#comment-15339719
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Anton Vinogradov commented on IGNITE-3152:
------------------------------------------

Semantic of {{ClusterNode.isClient()}} is:
{{Tests whether or not this node is connected to cluster as a client.}}
and it's properly used to detect is another node joined to server topology or 
not. 

{{TcpDiscoveryIpFinderAdapter.discoveryClientMode()}}
Used at joining node. Similar check used at 
{{org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi#spiStart}}

So, basicly, {{TcpDiscoveryIpFinderAdapter.discoveryClientMode()}} is a cause 
and {{ClusterNode.isClient()}} is an effect.
Seems both method is reqired, and both works correct.

> Client node's addresses are registered in IP finder
> ---------------------------------------------------
>
>                 Key: IGNITE-3152
>                 URL: https://issues.apache.org/jira/browse/IGNITE-3152
>             Project: Ignite
>          Issue Type: Bug
>          Components: general
>    Affects Versions: 1.5.0.final
>            Reporter: Valentin Kulichenko
>            Assignee: Anton Vinogradov
>              Labels: important
>             Fix For: 1.7
>
>         Attachments: Test.java
>
>
> Currently client node register its addresses in IP finder and never 
> deregisters them. Also looks like coordinator address is also not removed.
> The simple test that shows this behavior is attached.



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