Nishkam Ravi created KAFKA-8970:
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Summary: StateDirectory creation fails with Exception
Key: KAFKA-8970
URL: https://issues.apache.org/jira/browse/KAFKA-8970
Project: Kafka
Issue Type: Bug
Reporter: Nishkam Ravi
When two threads try to create KafkaStreams simultaneously, one of them
succeeds while the other fails with the following exception:
org.apache.kafka.streams.errors.StreamsException:
org.apache.kafka.streams.errors.ProcessorStateException: base state directory
[/tmp/kafka-streams] doesn't exist and couldn't be created
Quick investigation suggests that this is because the code at/around:
[https://github.com/apache/kafka/blob/trunk/streams/src/main/java/org/apache/kafka/streams/processor/internals/StateDirectory.java#L82]
is not synchronized and can lead to race conditions.
Specifying different values for state.dir can be a workaround for this issue
but a bit cumbersome. Can we just make this synchronized?
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