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https://issues.apache.org/jira/browse/KAFKA-10030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-10030.
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Resolution: Fixed
> Throw exception while fetching a key from a single partition
> ------------------------------------------------------------
>
> Key: KAFKA-10030
> URL: https://issues.apache.org/jira/browse/KAFKA-10030
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 2.5.0
> Environment: StreamsConfig.NUM_STREAM_THREADS_CONFIG=2
> Reporter: Dima R
> Assignee: Dima R
> Priority: Major
> Labels: KAFKA-9445, KIP-562
> Fix For: 2.6.0, 2.5.1
>
>
> StreamThreadStateStoreProvider#stores throws exception whenever taskId is not
> found, which is not correct behaviour in multi-threaded env where state store
> partitions are distributed among several StreamTasks.
> {code:java}
> final Task task = tasks.get(keyTaskId);
> if (task == null) {
> throw new InvalidStateStoreException(
> String.format("The specified partition %d for store %s does not exist.",
> storeQueryParams.partition(),
> storeName));
> }{code}
> Reproducible with KStream number of threads more then 1
> StoreQueryIntegrationTest#streamsConfiguration
> config.put(StreamsConfig.NUM_STREAM_THREADS_CONFIG, 2);
>
> Suggested solution is to not throw exception if at least one state store is
> found
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