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From "Matthias J. Sax (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-6398) Stream-Table join fails, if table is not materialized
Date Thu, 21 Dec 2017 22:20:00 GMT
Matthias J. Sax created KAFKA-6398:
--------------------------------------

             Summary: Stream-Table join fails, if table is not materialized
                 Key: KAFKA-6398
                 URL: https://issues.apache.org/jira/browse/KAFKA-6398
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 0.11.0.1
            Reporter: Matthias J. Sax


Using a non-materialized KTable in a stream-table join fails:

{noformat}
final KTable filteredKTable = builder.table("table-topic").filter(...);
builder.stream("stream-topic").join(filteredKTable,...);
{noformat}

fails with
{noformat}
org.apache.kafka.streams.errors.TopologyBuilderException: Invalid topology building: StateStore
null is not added yet.

	at org.apache.kafka.streams.processor.TopologyBuilder.connectProcessorAndStateStore(TopologyBuilder.java:1021)
	at org.apache.kafka.streams.processor.TopologyBuilder.connectProcessorAndStateStores(TopologyBuilder.java:949)
	at org.apache.kafka.streams.kstream.internals.KStreamImpl.doStreamTableJoin(KStreamImpl.java:621)
	at org.apache.kafka.streams.kstream.internals.KStreamImpl.join(KStreamImpl.java:577)
	at org.apache.kafka.streams.kstream.internals.KStreamImpl.join(KStreamImpl.java:563)
{noformat}

Adding a store name is not sufficient as workaround but fails differently:
{noformat}
final KTable filteredKTable = builder.table("table-topic").filter(..., "STORE-NAME");
builder.stream("stream-topic").join(filteredKTable,...);
{noformat}

error:
{noformat}
org.apache.kafka.streams.errors.StreamsException: failed to initialize processor KSTREAM-JOIN-0000000005

	at org.apache.kafka.streams.processor.internals.ProcessorNode.init(ProcessorNode.java:113)
	at org.apache.kafka.streams.processor.internals.StreamTask.initTopology(StreamTask.java:339)
	at org.apache.kafka.streams.processor.internals.StreamTask.initialize(StreamTask.java:153)
Caused by: org.apache.kafka.streams.errors.TopologyBuilderException: Invalid topology building:
Processor KSTREAM-JOIN-0000000005 has no access to StateStore KTABLE-SOURCE-STATE-STORE-0000000000
	at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.getStateStore(ProcessorContextImpl.java:69)
	at org.apache.kafka.streams.kstream.internals.KTableSourceValueGetterSupplier$KTableSourceValueGetter.init(KTableSourceValueGetterSupplier.java:45)
	at org.apache.kafka.streams.kstream.internals.KTableFilter$KTableFilterValueGetter.init(KTableFilter.java:121)
	at org.apache.kafka.streams.kstream.internals.KStreamKTableJoinProcessor.init(KStreamKTableJoinProcessor.java:44)
	at org.apache.kafka.streams.processor.internals.ProcessorNode$2.run(ProcessorNode.java:53)
	at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:201)
	at org.apache.kafka.streams.processor.internals.ProcessorNode.init(ProcessorNode.java:111)
{noformat}

One can workaround by piping the result through a topic:
{noformat}
final KTable filteredKTable = builder.table("table-topic").filter(...).through("TOPIC");;
builder.stream("stream-topic").join(filteredKTable,...);
{noformat}



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