GitHub user SlevinBE opened a pull request:
https://github.com/apache/kafka/pull/2741
KAFKA-4953: Global Store: cast exception when initialising with in-memory
logged state store
Currently it is not possible to initialise a global store with an in-memory
logged store via the TopologyBuilder. This results in the following exception:
```
java.lang.ClassCastException:
org.apache.kafka.streams.processor.internals.GlobalProcessorContextImpl cannot
be cast to org.apache.kafka.streams.processor.internals.RecordCollector$Supplier
at
org.apache.kafka.streams.state.internals.StoreChangeLogger.<init>(StoreChangeLogger.java:52)
at
org.apache.kafka.streams.state.internals.StoreChangeLogger.<init>(StoreChangeLogger.java:44)
at
org.apache.kafka.streams.state.internals.InMemoryKeyValueLoggedStore.init(InMemoryKeyValueLoggedStore.java:56)
at
org.apache.kafka.streams.state.internals.MeteredKeyValueStore$7.run(MeteredKeyValueStore.java:99)
at
org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:187)
at
org.apache.kafka.streams.state.internals.MeteredKeyValueStore.init(MeteredKeyValueStore.java:130)
at
org.apache.kafka.streams.processor.internals.GlobalStateManagerImpl.initialize(GlobalStateManagerImpl.java:97)
at
org.apache.kafka.streams.processor.internals.GlobalStateUpdateTask.initialize(GlobalStateUpdateTask.java:61)
at
org.apache.kafka.test.ProcessorTopologyTestDriver.<init>(ProcessorTopologyTestDriver.java:215)
at
org.apache.kafka.streams.processor.internals.ProcessorTopologyTest.shouldDriveInMemoryLoggedGlobalStore(ProcessorTopologyTest.java:235)
...
```
This PR includes a unit test to verify this behaviour.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/Klarrio/kafka
global_store_in_memory_logged_state_store_unit_test
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/2741.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2741
----
commit 8cfe3523d0c0bcdd3d472ecf6d52b600110c2149
Author: Yennick Trevels <yennick.trev...@klarrio.com>
Date: 2017-03-27T10:29:13Z
add failing unit test to verify behaviour of a global store bug in
combination with an in-memory logged state store
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