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https://issues.apache.org/jira/browse/BEAM-6315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Maximilian Michels updated BEAM-6315:
-------------------------------------
    Description: 
When start has not been called on the Readers of CountingSource, the checkpoint 
may contain a null value which lets the AvroCoder fail with a 
NullpointerException.



  was:When start has not been called on the Readers of CountingSource, the 
checkpoint contains a null value which lets the AvroCoder fail with a 
NullpointerException.


> UnboundedSourceWrapper checkpoints before starting Readers
> ----------------------------------------------------------
>
>                 Key: BEAM-6315
>                 URL: https://issues.apache.org/jira/browse/BEAM-6315
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-flink
>            Reporter: Maximilian Michels
>            Priority: Minor
>
> When start has not been called on the Readers of CountingSource, the 
> checkpoint may contain a null value which lets the AvroCoder fail with a 
> NullpointerException.



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