@Override
  public long incMemStoreSize(long dataSizeDelta, long heapSizeDelta, long offHeapSizeDelta,
    int cellsCountDelta) {
    this.offHeapSize += offHeapSizeDelta;
    this.heapSize += heapSizeDelta;
    this.dataSize += dataSizeDelta;
    this.cellsCount += cellsCountDelta;
    return this.dataSize;
  }
Accounting of current heap and data sizes. <em>NOT THREAD SAFE</em>. Use in a 'local' context
only where just a single-thread is updating. No concurrency! Used, for example, when summing all
Cells in a single batch where result is then applied to the Store.
@see ThreadSafeMemStoreSizing
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/NonThreadSafeMemStoreSizing.java