[zeromq-dev] pyzmq issue: _pickle.UnpicklingError: pickle data was truncated

[CZ]

I am running some python project based on client/server framework. It is something like rpclient/rpcserver. pyzmq is a very important part of this project. Now we are running into some trouble because of some errors in pyzmq. Please refer to the following error msg:Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Users\DELL\AppData\Local\Programs\Python\Python37\lib\threading.py", line 926, in _bootstrap_inner
    self.run()
  File "C:\Users\DELL\AppData\Local\Programs\Python\Python37\lib\threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "D:\DellProjs\oly\Oly\olympos\q_core\rpc\__init__.py", line 372, in run
    topic, data = self.__socket_sub.recv_pyobj(flags=NOBLOCK)
  File "C:\Dev\Py37venv\lib\site-packages\zmq\sugar\socket.py", line 976, in recv_pyobj
    return self._deserialize(msg, pickle.loads)
  File "C:\Dev\Py37venv\lib\site-packages\zmq\sugar\socket.py", line 834, in _deserialize
    return load(recvd)
_pickle.UnpicklingError: pickle data was truncated



I am using Python3.7.9 (actually I tried python3.7.9 and. python3.11, the same error msg) in windows 11, and pyzmq 25.1.1. The msg I am sending is really small. No way it would blow the buffer. I am using PUB at server side and SUB at client side (I always saw XPUB and XSUB in the zmq.constants. Could they possibly be another choices). I saw flags have 3 different values (corret me if I was wrong), NOWAIT, NOBLOCK, SNDMORE. I am not sure if the choice of flags value could be the reason.


Any of your input would be highly appreciated.  Thanks!


CZ.
 
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