By simply adding 'toJSON' before 'writeStream' the problem was fixed. Maybe
it will help someone.
On Tue, Mar 3, 2020 at 6:02 PM Something Something <mailinglist...@gmail.com>
wrote:
> In a Stateful Spark Streaming application I am writing the 'OutputRow' in
> the 'updateAcrossEvents' but I keep getting this error (*Required
> attribute 'value' not found*) while it's trying to write to Kafka. I know
> from the documentation that 'value' attribute needs to be set but how do I
> do that in the 'Stateful Structured Streaming'? Where & how do I add this
> 'value' attribute in the following code? *Note: I am using Spark 2.3.1*
>
> withEventTime
> .as[R00tJsonObject]
> .withWatermark("event_time", "5 minutes")
> .groupByKey(row => (row.value.Id, row.value.time.toString,
> row.value.cId))
>
> .mapGroupsWithState(GroupStateTimeout.EventTimeTimeout)(updateAcrossEvents)
> .writeStream
> .format("kafka")
> .option("kafka.bootstrap.servers", "localhost:9092")
> .option("topic", "myTopic")
> .option("checkpointLocation", "/Users/username/checkpointLocation")
> .outputMode("update")
> .start()
> .awaitTermination()
>
>
