[jira] [Created] (IGNITE-6182) Change default max memory size from 80% to 20%

[Anton Vinogradov (Jira)]

Vladimir Ozerov created IGNITE-6182:
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             Summary: Change default max memory size from 80% to 20%
                 Key: IGNITE-6182
                 URL: https://issues.apache.org/jira/browse/IGNITE-6182
             Project: Ignite
          Issue Type: Task
          Components: general
    Affects Versions: 2.1
            Reporter: Vladimir Ozerov
            Assignee: Igor Seliverstov
            Priority: Critical
             Fix For: 2.2


Currently we can allocate up to 80% of available RAM by default. It could lead to swap with potential risk of hang.

In order to improve user experience, we need to do the following:
1) Decrease default to 20% ({{MemoryConfiguration.DFLT_MEMORY_POLICY_FRACTION}})
2) When node starts it should sum max sizes of all memory regions plus Java's XMX. If result is greater than 50% of total RAM, we should issue a warning about potential swap.



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