public String getStatus() {
    String waiting, done;
    synchronized (joinBarrierLock) {
      waiting = acquiringMembers.toString();
      done = inBarrierMembers.toString();
    }
    return "Procedure " + procName + " { waiting=" + waiting + " done=" + done + " }";
  }
Returns String of the procedure members both trying to enter the barrier and already in barrier
hbase-server/src/main/java/org/apache/hadoop/hbase/procedure/Procedure.java