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https://issues.apache.org/jira/browse/KAFKA-4461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang reassigned KAFKA-4461:
------------------------------------
Assignee: Adrian McCague
> When using ProcessorTopologyTestDriver, the combination of map and
> .groupByKey does not produce any result
> ----------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-4461
> URL: https://issues.apache.org/jira/browse/KAFKA-4461
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.1.0
> Reporter: Hamidreza Afzali
> Assignee: Adrian McCague
> Labels: newbie, unit-test
>
> *Problem*
> When using ProcessorTopologyTestDriver in the latest Kafka 0.10.1, the
> combination of map and .groupByKey does not produce any result. However, it
> works fine when using KStreamTestDriver.
> The topology looks like this:
> {code}
> builder.stream(Serdes.String, Serdes.Integer, inputTopic)
> .map((k, v) => new KeyValue(fn(k), v))
> .groupByKey(Serdes.String, Serdes.Integer)
> .count(stateStore)
> {code}
> *Full examples*
> Examples for ProcessorTopologyTestDriver and KStreamTestDriver:
> https://gist.github.com/hrafzali/c2f50e7b957030dab13693eec1e49c13
> *Additional info*
> kafka-users mailing list:
> http://mail-archives.apache.org/mod_mbox/kafka-users/201611.mbox/%3CCAHwHRrVq1APVkNhP3HVqxujxRJEP9FwHV2NRcvPPsHX7Wujzng%40mail.gmail.com%3E
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