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https://issues.apache.org/jira/browse/BEAM-1395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15854346#comment-15854346
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ASF GitHub Bot commented on BEAM-1395:
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Github user asfgit closed the pull request at:
https://github.com/apache/beam/pull/1924
> SparkGroupAlsoByWindowFn not sorting grouped elements by timestamp
> ------------------------------------------------------------------
>
> Key: BEAM-1395
> URL: https://issues.apache.org/jira/browse/BEAM-1395
> Project: Beam
> Issue Type: Bug
> Components: runner-spark
> Reporter: Amit Sela
> Assignee: Amit Sela
>
> SparkGroupAlsoByWindowFn relies on the grouped elements (pre key) to be
> sorted by their timestamp, which is not the case, and so could cause:
> {code}
> IllegalStateException: Cannot move input watermark time backwards
> {code}
> We should sort the values first, just like with {{Combine}} implementations:
> https://github.com/apache/beam/blob/master/runners/spark/src/main/java/org/apache/beam/runners/spark/translation/SparkKeyedCombineFn.java#L73
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