protected void applyFamilyMapToMemStore(Map<byte[], List<ExtendedCell>> familyMap,
      MemStoreSizing memstoreAccounting) {
      for (Map.Entry<byte[], List<ExtendedCell>> e : familyMap.entrySet()) {
        byte[] family = e.getKey();
        List<ExtendedCell> cells = e.getValue();
        assert cells instanceof RandomAccess;
        region.applyToMemStore(region.getStore(family), cells, false, memstoreAccounting);
      }
    }
Atomically apply the given map of family->edits to the memstore. This handles the consistency
control on its own, but the caller should already have locked updatesLock.readLock(). This
also does <b>not</b> check the families for validity.
@param familyMap Map of Cells by family
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java