@Override
  public void putAll(final Map<? extends K, ? extends V> m) {
    for (final Map.Entry<? extends K, ? extends V> e : m.entrySet()) {
      put(e.getKey(), e.getValue());
    }
  }
Copies all of the mappings from the specified map to this one. These mappings replace any
mappings that this map had for any of the keys currently in the specified map.

@param m mappings to be stored in this map
geode-core/src/main/java/org/apache/geode/internal/util/concurrent/CustomEntryConcurrentHashMap.java