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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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Suneel Marthi reassigned BEAM-6315:
-----------------------------------
Assignee: Suneel Marthi
> 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
> Assignee: Suneel Marthi
> 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.
> UnboundedSourceWrapper should not attempt to checkpoint before the readers
> have been started. See UnboundedSource:
> {quote}getCheckpointMark not be called before \{@link #start\} has been
> called.{quote}
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