Denis Magda updated IGNITE-5490:
    Labels: iep-6  (was: )

> Implement replacement for obsolete CacheMetrics#getOffHeapAllocatedSize
> -----------------------------------------------------------------------
>                 Key: IGNITE-5490
>                 URL: https://issues.apache.org/jira/browse/IGNITE-5490
>             Project: Ignite
>          Issue Type: Improvement
>          Components: cache
>    Affects Versions: 2.0
>            Reporter: Ivan Rakov
>            Priority: Major
>              Labels: iep-6
> With new 2.0 architecture, many caches can share one memory policy. Memory 
> metrics allows to measure memory usage (loaded pages) for the whole policy. 
> However, there's also a need to measure how much memory (or pages) is used by 
> each cache.
> Before 2.0 such information was accessible with 
> CacheMetrics#getOffHeapAllocatedSize, but current implemetation returns 0.
> We should either implement it or provide alternative metrics (e. g. 
> approximate number of loaded pages per cache). Please note that if 
> persistence is *disabled*, precise number of loaded pages per cache is not 
> defined - one page can contain entries of different caches.

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