Dave Latham created HBASE-9089:
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Summary: 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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