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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