[jira] [Created] (FLINK-22605) Python UDF should only be created once regardless of how many times it is invoked

[Shang Yuanchun (Jira)]

Yik San Chan created FLINK-22605:
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             Summary: Python UDF should only be created once regardless of how many times it is invoked
                 Key: FLINK-22605
                 URL: https://issues.apache.org/jira/browse/FLINK-22605
             Project: Flink
          Issue Type: Improvement
          Components: API / Python
            Reporter: Yik San Chan


Follow up to http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/I-call-Pandas-UDF-N-times-do-I-have-to-initiate-the-UDF-N-times-tt43576.html.

Currently, when we call Python UDF N times, the Python UDF is constructed N times. This may become a concern to performance, when we want to load large resources in the open() method of the UDF, which is quite common in machine learning use cases.

I propose we optimize in PyFlink framework level s.t. no matter how many times a UDF is called in the execution environment, it is only initiated once.



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