[jira] [Updated] (IGNITE-20922) Java Thin: direct service invocation with ClientClusterGroup and Service Awareness

["Vladimir Steshin (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-20922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Steshin updated IGNITE-20922:
--------------------------------------
    Affects Version/s: 2.15

> 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: 2.15
>            Reporter: Vladimir Steshin
>            Assignee: Vladimir Steshin
>            Priority: Major
>              Labels: ise
>             Fix For: 2.17
>
>          Time Spent: 10m
>  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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