public void decGlobalMemStoreSize(long dataSizeDelta, long heapSizeDelta, long offHeapSizeDelta) {
    globalMemStoreDataSize.add(-dataSizeDelta);
    globalMemStoreHeapSize.add(-heapSizeDelta);
    globalMemStoreOffHeapSize.add(-offHeapSizeDelta);
  }
Returns the retained metrics of region's read and write requests count
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionServerAccounting.java