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https://issues.apache.org/jira/browse/BEAM-1636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15899517#comment-15899517
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ASF GitHub Bot commented on BEAM-1636:
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Github user asfgit closed the pull request at:
https://github.com/apache/beam/pull/2180
> UnboundedDataset action() does not materialize RDD
> --------------------------------------------------
>
> Key: BEAM-1636
> URL: https://issues.apache.org/jira/browse/BEAM-1636
> Project: Beam
> Issue Type: Bug
> Components: runner-spark
> Reporter: Aviem Zur
> Assignee: Aviem Zur
> Fix For: 0.6.0
>
>
> {{UnboundedDataset#action}} does not materialize DStream since it uses
> {{register}}. Instead use {{foreachRDD}}...{{foreach}} which is an action,
> which will materialize the RDDs of the DStream.
> The reason it worked until now was because there was also a call to
> {{cache()}} before it.
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