private static boolean isBackgroundTaskThread() {
    boolean result = false;
    Boolean tmp = backgroundTaskThread.get();
    if (tmp != null) {
      result = tmp;
    }
    return result;
  }
@return true if KRF files are used on this disk store's oplogs
geode-core/src/main/java/org/apache/geode/internal/cache/DiskStoreImpl.java