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https://issues.apache.org/jira/browse/IGNITE-20922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17798531#comment-17798531
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Mikhail Petrov commented on IGNITE-20922:
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[~vladsz83] Thank you for the contribution.
> Java Thin: direct service invocation with ClientClusterGroup and Service
> Awareness
> ----------------------------------------------------------------------------------
>
> Key: IGNITE-20922
> URL: https://issues.apache.org/jira/browse/IGNITE-20922
> Project: Ignite
> Issue Type: Improvement
> Affects Versions: 2.16
> Reporter: Vladimir Steshin
> Assignee: Vladimir Steshin
> Priority: Major
> Labels: ise
> Fix For: 2.17
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Once we implemented Service Awareness for Java Thin Client, we might improve
> the service invocation with `IgniteClient.services(ClientClusterGroup grp)`
> Consider:
> 1) There is a cluster with some nodes A, B, C, D, F
> 1) A service is deployed on nodes A,B,C
> 2) Service Awareness is enabled.
> 3) User limits the service instance nodes set with
> `IgniteClient.services('node A', 'node B')` skipping node C.
> 4) The thin client requests the service randomly on node C because it has the
> service instance too.
> 5) Node C redirects the invocation to node A or to node B as user required.
> We should prevent the redirection call at #5 and call service only on A or B.
> And this would help user to choose nodes for loading purposes.
> It looks simple to intersect passed `ClientClusterGroup` and known set of
> service instance nodes before the service calling. I.e. the client can
> exclude node C from the options where to send the invocation request.
> If user chosses `services('node A', 'node B', 'node F')`, where F has no
> service instance, we do not invoke F.
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