@Override
  public PersistentMemberID addMyInitializingPMID(PersistentMemberID pmid) {
    PersistentMemberID result = myInitializingId;
    myInitializingId = pmid;
    if (result != null) {
      myInitializedId = result;
    }
    return result;
  }
Used to initialize a PlaceHolderDiskRegion for a region that is being closed

@param drv the region that is being closed
geode-core/src/main/java/org/apache/geode/internal/cache/AbstractDiskRegion.java