public static String joinWithSeparator(Iterable<?> strings) {
    return org.apache.hadoop.util.StringUtils.join(TXN_WRITE_EVENT_FILE_SEPARATOR, strings);
  }
Thread to clear old files of cmroot recursively
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/ReplChangeManager.java