@Override
  public VersionSource getVersionMember() {
    if (getDataPolicy().withPersistence()) {
      return getDiskStore().getDiskStoreID();
    }
    return cache.getInternalDistributedSystem().getDistributedMember();
  }
Returns the member id of my distributed system

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