public boolean isEmpty() {
    for (Map.Entry<Long, BitSetNode> entry : map.entrySet()) {
      if (!entry.getValue().isEmpty()) {
        return false;
      }
    }
    return true;
  }
Returns true, if no procedure is active, else false.
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/store/wal/ProcedureStoreTracker.java