private void sendStopSignal() {
    if (lock.tryLock()) {
      try {
        waitCond.signalAll();
        syncCond.signalAll();
      } finally {
        lock.unlock();
      }
    }
  }
Used to construct the name of the log directory for master procedures
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/store/wal/WALProcedureStore.java