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https://issues.apache.org/jira/browse/FLINK-20521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Till Rohrmann closed FLINK-20521.
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Resolution: Fixed
Fixed via
1.13.0: 8d8125037adb678ad31b47809786b03628319db0
1.12.1: e2b3e86041df74e5e80a35a79e1a6066218083a1
> 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: 1.12.0, 1.11.2
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
> Priority: Major
> Labels: pull-request-available
> 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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