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

["Dmitriy Pavlov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-5490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16050235#comment-16050235 ] 

Dmitriy Pavlov commented on IGNITE-5490:
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This behaviour was also noticed by user http://apache-ignite-users.70518.x6.nabble.com/Ignite-Cache-Metrics-td13624.html


> 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 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 precise number of loaded pages per cache is not defined - one page can contain entries of different caches.



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