@Override
  public void foreachRegionEntry(LocalRegion.RegionEntryCallback callback) {
    throw new IllegalStateException(
        "foreachRegionEntry should not be called when validating disk store");
  }
A disk region that is created when doing offline validation.

@since GemFire prPersistSprint3
geode-core/src/main/java/org/apache/geode/internal/cache/ValidatingDiskRegion.java