@Retained
  private EntryEventImpl newCreateEntryEvent(Object key, Object value, Object aCallbackArgument) {

    validateArguments(key, value, aCallbackArgument);
    checkReadiness();
    checkForLimitedOrNoAccess();

    return entryEventFactory
        .create(this, Operation.CREATE, key, value, aCallbackArgument, false, getMyId())
        .setCreate(true);
  }
Returns the member id of my distributed system

@since GemFire 5.0
geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java