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From "Dmitry Minkovsky (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-5824) Cannot write to key value store provided by ProcessorTopologyTestDriver
Date Sat, 02 Sep 2017 01:14:00 GMT
Dmitry Minkovsky created KAFKA-5824:
---------------------------------------

             Summary: Cannot write to key value store provided by ProcessorTopologyTestDriver
                 Key: KAFKA-5824
                 URL: https://issues.apache.org/jira/browse/KAFKA-5824
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 0.11.0.0
            Reporter: Dmitry Minkovsky


I am trying to `put()` to a KeyValueStore that I got from ProcessorTopologyTestDriver#getKeyValueStore()
as part of setup for a test. The JavaDoc endorses this use-case:

     * This is often useful in test cases to pre-populate the store before the test case instructs
the topology to
     * {@link #process(String, byte[], byte[]) process an input message}, and/or to check
the store afterward.

However, the `put()` results in the following error: 

{{
java.lang.IllegalStateException: This should not happen as offset() should only be called
while a record is processed

	at org.apache.kafka.streams.processor.internals.AbstractProcessorContext.offset(AbstractProcessorContext.java:139)
	at org.apache.kafka.streams.state.internals.CachingKeyValueStore.put(CachingKeyValueStore.java:193)
	at org.apache.kafka.streams.state.internals.CachingKeyValueStore.put(CachingKeyValueStore.java:188)
	at pony.UserEntityTopologySupplierTest.confirm-settings-requests(UserEntityTopologySupplierTest.groovy:81)
}}

This error seems straightforward: I am not doing the `put` within the context of stream processing.
How do I reconcile this with the fact that I am trying to populate the store for a test, which
the JavaDoc endorses?

Thank you,
Dmitry



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