@Override
  protected boolean validate(Path file) {
    return AbstractFSWALProvider.validateWALFilename(file.getName())
      || MasterProcedureUtil.validateProcedureWALFilename(file.getName())
      || file.getName().endsWith(MasterRegionFactory.ARCHIVED_WAL_SUFFIX);
  }
@param period    the period of time to sleep between each run
@param stopper   the stopper
@param conf      configuration to use
@param fs        handle to the FS
@param oldLogDir the path to the archived logs
@param pool      the thread pool used to scan directories
hbase-server/src/main/java/org/apache/hadoop/hbase/master/cleaner/LogCleaner.java