Dima R created KAFKA-10030:
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Summary: 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
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, which is always true when using StoreQueryParameters.withPartition
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