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https://issues.apache.org/jira/browse/BEAM-5690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16643682#comment-16643682
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Kenneth Knowles commented on BEAM-5690:
---------------------------------------
CC [~kedin] [~apilloud] [~xumingming] [~mingmxu] [~amaliujia]
Since it is not reproduced in the Flink runner or Direct runner, the SQL
implementation of GROUP BY is probably triggering some latent bug in the Spark
runner's streaming mode.
> Issue with GroupByKey in BeamSql using SparkRunner
> --------------------------------------------------
>
> Key: BEAM-5690
> URL: https://issues.apache.org/jira/browse/BEAM-5690
> Project: Beam
> Issue Type: Task
> Components: runner-spark
> Reporter: Kenneth Knowles
> Priority: Major
>
> Reported on user@
> {quote}We are trying to setup a pipeline with using BeamSql and the trigger
> used is default (AfterWatermark crosses the window).
> Below is the pipeline:
>
> KafkaSource (KafkaIO)
> ---> Windowing (FixedWindow 1min)
> ---> BeamSql
> ---> KafkaSink (KafkaIO)
>
> We are using Spark Runner for this.
> The BeamSql query is:
> {code}select Col3, count(*) as count_col1 from PCOLLECTION GROUP BY Col3{code}
> We are grouping by Col3 which is a string. It can hold values string[0-9].
>
> The records are getting emitted out at 1 min to kafka sink, but the output
> record in kafka is not as expected.
> Below is the output observed: (WST and WET are indicators for window start
> time and window end time)
> {code}
> {"count_col1":1,"Col3":"string5","WST":"2018-10-09 09-55-00 0000
> +0000","WET":"2018-10-09 09-56-00 0000 +0000"}
> {"count_col1":3,"Col3":"string7","WST":"2018-10-09 09-55-00 0000
> +0000","WET":"2018-10-09 09-56-00 0000 +0000"}
> {"count_col1":2,"Col3":"string8","WST":"2018-10-09 09-55-00 0000
> +0000","WET":"2018-10-09 09-56-00 0000 +0000"}
> {"count_col1":1,"Col3":"string2","WST":"2018-10-09 09-55-00 0000
> +0000","WET":"2018-10-09 09-56-00 0000 +0000"}
> {"count_col1":1,"Col3":"string6","WST":"2018-10-09 09-55-00 0000
> +0000","WET":"2018-10-09 09-56-00 0000 +0000"}
> {"count_col1":0,"Col3":"string6","WST":"2018-10-09 09-55-00 0000
> +0000","WET":"2018-10-09 09-56-00 0000 +0000"}
> {"count_col1":0,"Col3":"string6","WST":"2018-10-09 09-55-00 0000
> +0000","WET":"2018-10-09 09-56-00 0000 +0000"}
> {"count_col1":0,"Col3":"string6","WST":"2018-10-09 09-55-00 0000
> +0000","WET":"2018-10-09 09-56-00 0000 +0000"}
> {"count_col1":0,"Col3":"string6","WST":"2018-10-09 09-55-00 0000
> +0000","WET":"2018-10-09 09-56-00 0000 +0000"}
> {"count_col1":0,"Col3":"string6","WST":"2018-10-09 09-55-00 0000
> +0000","WET":"2018-10-09 09-56-00 0000 +0000"}
> {"count_col1":0,"Col3":"string6","WST":"2018-10-09 09-55-00 0000
> +0000","WET":"2018-10-09 09-56-00 0}
> {code}
> {quote}
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