@Override
    public String toString() {
      Procedure<?> p = this.activeProcedure;
      return getName() + "(pid=" + (p == null ? Procedure.NO_PROC_ID : p.getProcId() + ")");
    }
Encapsulates execution of the current {@link #activeProcedure} for easy tracing.
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/ProcedureExecutor.java