Bart Vercammen created KAFKA-4791:
-------------------------------------
Summary: Kafka Streams - unable to add state stores when using
wildcard topics on the source
Key: KAFKA-4791
URL: https://issues.apache.org/jira/browse/KAFKA-4791
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 0.10.1.1
Environment: Java 8
Reporter: Bart Vercammen
I'm trying to build up a topology (using TopologyBuilder) with following
components :
{code}
new TopologyBuilder()
.addSource("ingest", Pattern.compile( ... ))
.addProcessor("myprocessor", ..., "ingest")
.addStateStore(dataStore, "myprocessor")
{code}
Somehow this does not seem to work.
When creating the topology with exact topic names, all works fine, but it seems
not possible to attach state stores when using wildcard topics on the sources.
Inside {{addStateStore}}, the processor gets connected to the state store with
{{connectProcessorAndStateStore}}, and there it will try to connect the state
store with the source topics from the processor:
{{connectStateStoreNameToSourceTopics}}
Here lies the problem:
{code}
private Set<String> findSourceTopicsForProcessorParents(String [] parents) {
final Set<String> sourceTopics = new HashSet<>();
for (String parent : parents) {
NodeFactory nodeFactory = nodeFactories.get(parent);
if (nodeFactory instanceof SourceNodeFactory) {
sourceTopics.addAll(Arrays.asList(((SourceNodeFactory)
nodeFactory).getTopics()));
} else if (nodeFactory instanceof ProcessorNodeFactory) {
sourceTopics.addAll(findSourceTopicsForProcessorParents(((ProcessorNodeFactory)
nodeFactory).parents));
}
}
return sourceTopics;
}
{code}
The call to {{sourceTopics.addAll(Arrays.asList(((SourceNodeFactory)
nodeFactory).getTopics()))}} will fail as there are no topics inside the
{{SourceNodeFactory}} object, only a pattern ({{.getTopics}} returns null)
I also tried to search for some unit tests inside the Kafka Streams project
that cover this scenario, but alas, I was not able to find any.
Only some tests on state stores with exact topic names, and some tests on
wildcard topics, but no combination of both ...
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