@Override
  protected void postDestroyRegion(boolean destroyDiskRegion, RegionEventImpl event) {
    distributedRegionCleanup(event);

    try {
      super.postDestroyRegion(destroyDiskRegion, event);
    } catch (CancelException e) {
      // I don't think this should ever happens: bulletproofing for bug 39454
      logger.warn("postDestroyRegion: encountered cancellation", e);
    }
  }
Free resources held by this region. This method is invoked after isDestroyed has been set to
true.
geode-core/src/main/java/org/apache/geode/internal/cache/DistributedRegion.java