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https://issues.apache.org/jira/browse/BEAM-6315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16738462#comment-16738462
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Suneel Marthi commented on BEAM-6315:
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Yes please
On Wed, Jan 9, 2019 at 12:14 PM Maximilian Michels (JIRA) <[email protected]>
> 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.
> 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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