[jira] [Created] (FLINK-20521) Null result values are being swallowed by RPC system

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-20521:
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             Summary: Null result values are being swallowed by RPC system
                 Key: FLINK-20521
                 URL: https://issues.apache.org/jira/browse/FLINK-20521
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Coordination
    Affects Versions: 1.11.2, 1.12.0
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann
             Fix For: 1.13.0, 1.12.1


If an RPC method returns a {{null}} value, then it seems that the request future won't get completed as reported in FLINK-17921.

We should either not allow to return {{null}} values as responses or make sure that a {{null}} value is properly transmitted to the caller.



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