[jira] [Assigned] (IGNITE-5578) Discovery events coalescing

["Semen Boikov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-5578?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Semen Boikov reassigned IGNITE-5578:
------------------------------------

    Assignee: Semen Boikov

> Discovery events coalescing
> ---------------------------
>
>                 Key: IGNITE-5578
>                 URL: https://issues.apache.org/jira/browse/IGNITE-5578
>             Project: Ignite
>          Issue Type: Improvement
>          Components: cache, general
>    Affects Versions: 1.0
>            Reporter: Alexey Goncharuk
>            Assignee: Semen Boikov
>             Fix For: 2.2
>
>
> There is an issue that has been in Ignite long ago and with the growing community and growing cluster sizes, it becomes more tangible.
> When a bunch of nodes leave or join cluster, we generate a separate discovery event for each node, and each discovery event generates a partition map exchange. 
> The first idea that came to my mind was to coalesce the partition map exchanges, but this is extremely difficult to implement on unstable topology.
> Instead, we can introduce NODES_JOINED / NODES_FAILED events and batch multiple events on discovery level when possible. In this case, very few extra partition map exchanges are possible.



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