@Override
  public void onEvent(MemoryEvent event) {
    if (logger.isDebugEnabled()) {
      logger.debug("Region:{} received a Memory event.{}", this, event);
    }
    setMemoryThresholdFlag(event);
  }
Execute the provided named function in all locations that contain the given keys. So function
can be executed on just one fabric node, executed in parallel on a subset of nodes in parallel
across all the nodes.

@since GemFire 5.8Beta
geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java