Bill Bejeck created KAFKA-8199:
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Summary: ClassCastException when trying to groupBy after suppress
Key: KAFKA-8199
URL: https://issues.apache.org/jira/browse/KAFKA-8199
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 2.1.0
Reporter: Bill Bejeck
Fix For: 2.3.0
A topology with a groupBy after a suppress operation results in a
ClassCastException
The following sample topology
{noformat}
Properties properties = new Properties();
properties.put(StreamsConfig.APPLICATION_ID_CONFIG, "appid");
properties.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG,"localhost");
StreamsBuilder builder = new StreamsBuilder(); builder.<String,
String>stream("topic").groupByKey().windowedBy(TimeWindows.of(Duration.ofSeconds(30))).count()
.suppress(Suppressed.untilTimeLimit(Duration.ofHours(1),
BufferConfig.unbounded())) .groupBy((k, v) ->
KeyValue.pair(k,v)).count().toStream(); builder.build(properties);
{noformat}
results in this exception:
{noformat}
java.lang.ClassCastException:
org.apache.kafka.streams.kstream.internals.KTableImpl$$Lambda$4/2084435065
cannot be cast to
org.apache.kafka.streams.kstream.internals.KTableProcessorSupplier{noformat}
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