public boolean isLocked() {
    return pipeTaskCoordinatorLock.isLocked();
  }
Unlock the pipe task coordinator. Calling this method will clear the pipe task info holder,
which means that the holder will be null after calling this method.

@return {@code true} if successfully unlocked, {@code false} if current thread is not holding
    the lock.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/pipe/coordinator/task/PipeTaskCoordinator.java