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https://issues.apache.org/jira/browse/BEAM-6315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16733682#comment-16733682
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Maximilian Michels commented on BEAM-6315:
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This needs to be fixed in the UnboundedSourceWrapper. It shouldn't checkpoint
Readers before calling start() on them.
> CountingSource returns CheckpointMark with null date
> ----------------------------------------------------
>
> Key: BEAM-6315
> URL: https://issues.apache.org/jira/browse/BEAM-6315
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Reporter: Maximilian Michels
> Assignee: Maximilian Michels
> Priority: Minor
>
> 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.
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