public File getKrfFile() {
    return new File(diskFile.getPath() + KRF_FILE_EXT);
  }
Create the KRF file for this oplog. It is ok for this method to be async. finishKRF will be
called and it must block until KRF generation is complete.

@param cancel if true then prevent the krf from being created if possible
geode-core/src/main/java/org/apache/geode/internal/cache/Oplog.java