public boolean contains(long procId) {
    return procMap.containsKey(procId);
  }
@return True if this new procedure is 'richer' than the current one else false and we log this
        incidence where it appears that the WAL has older entries appended after newer ones.
        See HBASE-18152.
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/store/wal/WALProcedureMap.java