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https://issues.apache.org/jira/browse/IGNITE-12853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17074681#comment-17074681
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Igor Sapego commented on IGNITE-12853:
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[~alex_pl] It's not dummy, it's implemented for User Attributes, which are not
yet released.
> ThinClient: Introduce Features for thin clients
> -----------------------------------------------
>
> Key: IGNITE-12853
> URL: https://issues.apache.org/jira/browse/IGNITE-12853
> Project: Ignite
> Issue Type: Bug
> Components: thin client
> Reporter: Igor Sapego
> Assignee: Igor Sapego
> Priority: Major
> Fix For: 2.8.1
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> As we have a lot of different thin clients now, maintained by different
> people, the issues with our backward compatibility mechanism becomes more and
> more prominent.
> Currently, we use protocol versioning as the only approach to provide
> backward compatibility. The main issue of this approach is that we can not
> skip some change in protocol and implement i.e. protocol of version 1.5
> without implementation of 1.4. There are many cases when one may want to do
> so: e.g. when feature provided in 1.4 is not relevant for a specific client,
> or when protocol version 1.5 contains urgent fix or feature which is easy to
> implement, but its blocked by not-so-urgent and hard-to-implement feature
> introduced in 1.4.
> So to fix this issue I propose to introduce another backward compatibility
> mechanism. The idea is to send "supported features" mask by a client to a
> server, which should be answered with the same mask by the server. The
> resulting set of enabled features is acquired with a simple logical "AND"
> operation on these two masks.
> This change has many other positive effects:
> 1. It improves readability and also potentially simplifies debugging.
> 2. It gives users the ability to enable or disable features of thin clients
> on both server and client as they desire.
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