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https://issues.apache.org/jira/browse/BEAM-1656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15902397#comment-15902397
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Kenneth Knowles commented on BEAM-1656:
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Let's actually change the spec so finalize is idempotent.
> DirectRunner should not call finalize twice in UnboundedSourceExecutorFactory
> -----------------------------------------------------------------------------
>
> Key: BEAM-1656
> URL: https://issues.apache.org/jira/browse/BEAM-1656
> Project: Beam
> Issue Type: Bug
> Components: runner-direct
> Reporter: Ben Chambers
> Assignee: Thomas Groh
>
> In
> [getReader](https://github.com/apache/beam/blob/master/runners/direct-java/src/main/java/org/apache/beam/runners/direct/UnboundedReadEvaluatorFactory.java#L174)
> we call finalize on the checkpoint that arrived in the incoming shard. Then
> later in
> [finishRead](https://github.com/apache/beam/blob/master/runners/direct-java/src/main/java/org/apache/beam/runners/direct/UnboundedReadEvaluatorFactory.java#L205)
> we finalize the old checkpoint again.
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