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https://issues.apache.org/jira/browse/IGNITE-5385?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexei Scherbakov resolved IGNITE-5385.
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Resolution: Won't Fix
Fixed as a part of exchange optimizations for 2.1.4 by [~sboikov]
> Get rid of discovery custom message on exchange completion
> ----------------------------------------------------------
>
> Key: IGNITE-5385
> URL: https://issues.apache.org/jira/browse/IGNITE-5385
> Project: Ignite
> Issue Type: Improvement
> Components: cache
> Affects Versions: 2.0
> Reporter: Yakov Zhdanov
> Assignee: Alexei Scherbakov
> Priority: Blocker
> Labels: performance
> Fix For: 2.3
>
>
> Currently if late affinity assignment is on we send full partition map as a
> custom message to make sure all nodes get it. With greater number of nodes
> and caches this can cause significant slowdowns.
> We suggest to move sending to communication. In this case scenario with
> coordinator failure requires special handling, since in this case some nodes
> may receive full map, complete exchange and proceed with cache operations,
> while others may not received full map yet. In this case full map should be
> resend from new coordinator - it should be recalculated if none has received
> one from former coordinator or should be requested from one of the lucky
> receivers to get forwarded to other nodes.
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