void incMemStoreSize(long dataSizeDelta, long heapSizeDelta, long offHeapSizeDelta,
    int cellsCountDelta) {
    if (this.rsAccounting != null) {
      rsAccounting.incGlobalMemStoreSize(dataSizeDelta, heapSizeDelta, offHeapSizeDelta);
    }
    long dataSize = this.memStoreSizing.incMemStoreSize(dataSizeDelta, heapSizeDelta,
      offHeapSizeDelta, cellsCountDelta);
    checkNegativeMemStoreDataSize(dataSize, dataSizeDelta);
  }
Increase the size of mem store in this region and the size of global mem store
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java