[HBASE-9089] HRegion.heapSize is missing many fields

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Later
• Assignee: Unassigned
• Reporter: Dave Latham
• Created: 30/Jul/13 16:37
• Updated: 16/Jun/22 17:47
• Resolved: 16/Jun/22 17:47

Description

HRegion's heapSize method is missing many fields from its calculation.

The static value DEEP_OVERHEAD is missing these:

  // 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

and the actual heapSize() method doesn't take into account at least row locks, recent flushes, mvcc entries, and coprocessors. Possibly more.

Issue Links

• is related to: HBASE-13055 HRegion FIXED_OVERHEAD missed one boolean