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  1. Kafka
  2. KAFKA-4270

ClassCast for Agregation

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Critical
    • Resolution: Cannot Reproduce
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: streams
    • Labels:

      Description

      With defined serdes for intermediate topic in aggregation catch the ClassCastException: from custom class to the ByteArray.

      In debug I saw that defined serde isn't used for creation sinkNode (incide `org.apache.kafka.streams.kstream.internals.KGroupedTableImpl#doAggregate`)

      Instead defined serde inside aggregation call is used default Impl with empty plugs instead of implementations

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      userTable.join(
                  skicardsTable.groupBy { key, value -> KeyValue(value.skicardInfo.ownerId, value.skicardInfo) }
                          .aggregate(
                                  { mutableSetOf<SkicardInfo>() }, 
                                  { ownerId, skicardInfo, accumulator -> accumulator.put(skicardInfo) },
                                  { ownerId, skicardInfo, accumulator -> accumulator }, 
                                  skicardByOwnerIdSerde,
                                  skicardByOwnerIdTopicName
                          ),
                  { userCreatedOrUpdated, skicardInfoSet -> UserWithSkicardsCreatedOrUpdated(userCreatedOrUpdated.user, skicardInfoSet) }
          ).to(
                  userWithSkicardsTable
          )
      

      I think current behavior of `doAggregate` with serdes and/or stores setting up should be changed because that is incorrect in release 0.10.0.1-cp1 to.

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            • Assignee:
              damianguy Damian Guy
              Reporter:
              glhf_ Mykola Polonskyi
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              Dates

              • Created:
                Updated:
                Resolved: