[jira] [Created] (IGNITE-9011) RendezvousAffinity.excludeNeighbors should be removed and be a default behavior

["Dmitry Karachentsev (JIRA)" <ji...@apache.org>]

Dmitry Karachentsev created IGNITE-9011:
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             Summary: RendezvousAffinity.excludeNeighbors should be removed and be a default behavior
                 Key: IGNITE-9011
                 URL: https://issues.apache.org/jira/browse/IGNITE-9011
             Project: Ignite
          Issue Type: Improvement
          Components: cache
    Affects Versions: 2.6
            Reporter: Dmitry Karachentsev
             Fix For: 3.0


According to this [discussion | http://apache-ignite-developers.2346864.n4.nabble.com/Neighbors-exclusion-td32550.html], cache backup distribution should be more straightforward. 

Right now we have not obvious logic on how backups will be stored across nodes. For example:
1. If set nodeFilter, it will filter backup nodes and if there are not enough nodes there will be less backups...
2. If set property excludeNeighbors, it will ignore manually set backupFilter.
3. By default excludeNeighbors is false.

There seems no need to keep excludeNeighbors property at all and it should be removed. Instead, node always must do the best to distribute backups to different machines.

If user set backupFilter, it must be used, otherwise distribute backups to other machines if it's possible.



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