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From "Sunny Chan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-7083) Reduce memory usage of CachePartitionFullCountersMap
Date Fri, 01 Dec 2017 04:31:01 GMT
Sunny Chan created IGNITE-7083:
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             Summary: 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


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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