[jira] [Created] (IGNITE-6814) Detailed memory consumption on start and OOM reporting

["Denis Magda (JIRA)" <ji...@apache.org>]

Denis Magda created IGNITE-6814:
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             Summary: Detailed memory consumption on start and OOM reporting
                 Key: IGNITE-6814
                 URL: https://issues.apache.org/jira/browse/IGNITE-6814
             Project: Ignite
          Issue Type: Improvement
      Security Level: Public (Viewable by anyone)
    Affects Versions: 2.0
            Reporter: Denis Magda
            Priority: Critical
             Fix For: 2.4


Presently Ignite allocates 20% of RAM on a node startup, however, the user doesn't see automatically chosen memory settings. Also, if there a node runs out of RAM and throws an OOM error there are no hints on why this happened and how to fix it.

Suggestions: 
* Print out memory settings on startup for every data region set up (maximum size, initial size, etc.)
* Provide guidelines on how to overcome OOM when it happens. Specify a data region name with all its current parameters and suggest three possible things - tweak maximum memory, setup eviction policies or enable Ignite persistence. All this is covered in official docs: https://apacheignite.readme.io/docs#section-data-regions



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