[jira] [Created] (IGNITE-5490) Implement replacement for obsolete CacheMetrics#getOffHeapAllocatedSize

["Ivan Rakov (JIRA)" <ji...@apache.org>]

Ivan Rakov created IGNITE-5490:
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             Summary: 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


With 2.0 new 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 precise number of loaded pages per cache is not defined - one page can contain entries of differet caches.



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