@VisibleForTesting
  public static void reinitialize() {
    idsToInstantiators.clear();
    dsMap.clear();
    idsToHolders.clear();
    classNamesToHolders.clear();
  }
testhook that removes all registed instantiators
geode-core/src/main/java/org/apache/geode/internal/InternalInstantiator.java