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https://issues.apache.org/jira/browse/HBASE-9089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved HBASE-9089.
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Resolution: Later
> HRegion.heapSize is missing many fields
> ---------------------------------------
>
> Key: HBASE-9089
> URL: https://issues.apache.org/jira/browse/HBASE-9089
> Project: HBase
> Issue Type: Bug
> Reporter: Dave Latham
> Priority: Minor
>
> HRegion's heapSize method is missing many fields from its calculation.
> The static value DEEP_OVERHEAD is missing these:
> {noformat}
> // 1 x HashMap - coprocessorServiceHandlers
> // 6 org.cliffc.high_scale_lib.Counter - numMutationsWithoutWAL,
> dataInMemoryWithoutWAL,
> // checkAndMutateChecksPassed, checkAndMutateChecksFailed,
> readRequestsCount,
> // writeRequestsCount, updatesBlockedMs
> // 1 x HRegion$WriteState - writestate
> // 1 x RegionCoprocessorHost - coprocessorHost
> // 1 x RegionSplitPolicy - splitPolicy
> // 1 x MetricsRegion - metricsRegion
> // 1 x MetricsRegionWrapperImpl - metricsRegionWrapper
> {noformat}
> and the actual heapSize() method doesn't take into account at least row
> locks, recent flushes, mvcc entries, and coprocessors. Possibly more.
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