[jira] [Created] (KAFKA-12943) Bug in Kafka Streams Documentation (Aggregating)

["Rajesh KSV (Jira)" <ji...@apache.org>]

Rajesh KSV created KAFKA-12943:
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             Summary: Bug in Kafka Streams Documentation (Aggregating)
                 Key: KAFKA-12943
                 URL: https://issues.apache.org/jira/browse/KAFKA-12943
             Project: Kafka
          Issue Type: Bug
            Reporter: Rajesh KSV


In the doc, for aggregating function, the example is incorrect

[https://kafka.apache.org/documentation/streams/developer-guide/dsl-api.html#aggregating]

It says
{code:java}
KTable<byte[], Long> aggregatedStream = groupedStream.aggregate(
    () -> 0L, /* initializer */
    (aggKey, newValue, aggValue) -> aggValue + newValue.length(), /* adder */
    Materialized.as("aggregated-stream-store") /* state store name */
        .withValueSerde(Serdes.Long()); /* serde for aggregate value */{code}
Instead, it should be 
{code:java}
KTable<byte[], Long> aggregatedStream = groupedStream.aggregate(
    () -> 0L, /* initializer */
    (aggKey, newValue, aggValue) -> aggValue + newValue.length(), /* adder */
    Materialized.<String, Long, KeyValueStore<Bytes, byte[]>>as("aggregated-stream-store") /* state store name */
        .withValueSerde(Serdes.Long()); /* serde for aggregate value */ {code}
Otherwise, code won't work. I myself verified it. 

Reference

https://stackoverflow.com/questions/51040555/the-method-withvalueserde-in-the-type-materialized-is-not-applicable/51049472



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