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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