[
https://issues.apache.org/jira/browse/KAFKA-10417?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Leah Thomas resolved KAFKA-10417.
---------------------------------
Resolution: Fixed
> suppress() with cogroup() throws ClassCastException
> ---------------------------------------------------
>
> Key: KAFKA-10417
> URL: https://issues.apache.org/jira/browse/KAFKA-10417
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 2.6.0
> Reporter: Wardha Perinkada Kattu
> Assignee: Leah Thomas
> Priority: Critical
> Labels: kafka-streams
> Fix For: 2.8.0, 2.7.1
>
>
> Streams operation - `cogroup()`, `aggregate()` followed by `suppress()`
> throws `ClassCastException`
> Works fine without the `suppress()`
> Code block tested -
> {code:java}
> val stream1 = requestStreams.merge(successStreams).merge(errorStreams)
> .groupByKey(Grouped.with(Serdes.String(),
> serdesConfig.notificationSerde()))
> val streams2 = confirmationStreams
> .groupByKey(Grouped.with(Serdes.String(),
> serdesConfig.confirmationsSerde()))
> val cogrouped =
> stream1.cogroup(notificationAggregator).cogroup(streams2,
> confirmationsAggregator)
>
> .windowedBy(TimeWindows.of(Duration.ofMinutes(notificationStreamsConfig.joinWindowMinutes.toLong())).grace(Duration.ofMinutes(notificationStreamsConfig.graceDurationMinutes.toLong())))
> .aggregate({ null }, Materialized.`as`<String,
> NotificationMetric, WindowStore<Bytes,
> ByteArray>>("time-windowed-aggregated-stream-store")
>
> .withValueSerde(serdesConfig.notificationMetricSerde()))
> .suppress(Suppressed.untilWindowCloses(unbounded()))
> .toStream()
> {code}
> Exception thrown is:
> {code:java}
> Caused by: java.lang.ClassCastException: class
> org.apache.kafka.streams.kstream.internals.PassThrough cannot be cast to
> class org.apache.kafka.streams.kstream.internals.KTableProcessorSupplier
> (org.apache.kafka.streams.kstream.internals.PassThrough and
> org.apache.kafka.streams.kstream.internals.KTableProcessorSupplier are in
> unnamed module of loader 'app')
> {code}
> [https://stackoverflow.com/questions/63459685/kgroupedstream-with-cogroup-aggregate-suppress]
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