private void deleteOffsetFile(File storeDir, String offsetFileName) {
    File offsetFile = new File(storeDir, offsetFileName);
    if (offsetFile.exists()) {
      new FileUtil().rm(offsetFile);
    }
  }
Delete the given offsetFile for the store if it exists.
samza-core/src/main/java/org/apache/samza/storage/StorageManagerUtil.java