public static boolean validateProcedureWALFilename(String filename) {
    return PATTERN.matcher(filename).matches();
  }
A Procedure WAL file name is of the format: pv-&lt;wal-id&gt;.log where wal-id is 20 digits.
@param filename name of the file to validate
@return <tt>true</tt> if the filename matches a Procedure WAL, <tt>false</tt> otherwise
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/MasterProcedureUtil.java