[jira] [Resolved] (IGNITE-7083) Reduce memory usage of CachePartitionFullCountersMap

["Alexei Scherbakov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-7083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexei Scherbakov resolved IGNITE-7083.
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    Resolution: Won't Fix

> Reduce memory usage of CachePartitionFullCountersMap
> ----------------------------------------------------
>
>                 Key: IGNITE-7083
>                 URL: https://issues.apache.org/jira/browse/IGNITE-7083
>             Project: Ignite
>          Issue Type: Improvement
>          Components: cache
>    Affects Versions: 2.3
>         Environment: Any
>            Reporter: Sunny Chan
>            Assignee: Alexey Goncharuk
>            Priority: Major
>             Fix For: 2.9
>
>
> The Cache Partition Exchange Manager kept a copy of the already completed exchange. However, we have found that it uses a significant amount of memory. Upon further investigation using heap dump we have found that a large amount of memory is used by the CachePartitionFullCountersMap. We have also observed in most cases, these maps contains only 0s.
> Therefore I propose an optimization for this: Initially the long arrays to store initial update counter and update counter in the CPFCM will be null, and when you get the value and see these tables are null then we will return 0 for the counter. We only allocate the long arrays when there is any non-zero updates to the the map.
> In our tests, the amount of heap used by GridCachePartitionExchangeManager was around 70MB (67 copies of these CPFCM), after we apply the optimization it drops to around 9MB.



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