Jouni created KAFKA-7125:
----------------------------
Summary: Calling StreamsBuilderbuilder.build().describe() causes
java.util.NoSuchElementException: null
Key: KAFKA-7125
URL: https://issues.apache.org/jira/browse/KAFKA-7125
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 1.1.0
Reporter: Jouni
After adding a a processor and a sink to topology after a globalstore and then
calling StreamBuilder.build().describe() again (for debugging purposes and to
check I got the topology), had the following exception and stacktrace:
{{Caused by: java.util.NoSuchElementException: null}}
{{ at java.util.HashMap$HashIterator.nextNode(HashMap.java:1444)
~[na:1.8.0_171]}}
{{ at java.util.HashMap$KeyIterator.next(HashMap.java:1466) ~[na:1.8.0_171]}}
{{ at
org.apache.kafka.streams.processor.internals.InternalTopologyBuilder.describeGlobalStore(InternalTopologyBuilder.java:1323)
~[kafka-streams-1.1.0.jar:na]}}
{{ at
org.apache.kafka.streams.processor.internals.InternalTopologyBuilder.describe(InternalTopologyBuilder.java:1306)
~[kafka-streams-1.1.0.jar:na]}}
{{ at org.apache.kafka.streams.Topology.describe(Topology.java:647)
~[kafka-streams-1.1.0.jar:na]}}
Snipped of code that caused this:
{{ TopologyDescription td = builder.build().describe();}}
{{ String parent = null;}}
{{ // We get an iterator to a TreeSet sorted by processing order, and
just want the last one.}}
{{ for (TopologyDescription.GlobalStore store : td.globalStores()) {}}
{{ parent = store.processor().name();}}
{{ }}}
{{ TopologyDescription tdtd = builder.build().describe();}}
{{ builder.build().addProcessor("ROUTES-TO-SERVICES-FORWARDER", new
UnneededCruftSupplier(), parent);}}
{{ builder.build().addSink("FST-ROUTES-TO-SERVICES",
"fst-routes-to-services", Serdes.String().serializer(),
fstServiceListSerde.serializer(), "ROUTES-TO-SERVICES-FORWARDER");}}
{{ TopologyDescription tdtdtd = builder.build().describe();}}
Note that the exception is thrown on the last line of the code snippet, calling
describe again before adding anything works fine.
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