Hi Flink Community:
We are using the pyflink to develop a POC for our project. We encountered some 
questions while using the flink.

We are using the flink version 1.2, python3.7, data stream API

1. Do you have examples of providing a python customized class as a `result 
type`? Based on the documentation research, we found out only built-in types 
are supported in Python. Also, what is the payload size limitation inside the 
flink, do we have a recommendation for that?

2. Do you have examples of `flink run --python` data stream API codes to the 
cluster? We tried to do that, however the process hangs on a `socket read from 
the java gateway`, due to the lack of the missing logs, we are not sure what is 
missing while submitting the job.


Regards
Dc


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