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Sophie Blee-Goldman commented on KAFKA-8970: -------------------------------------------- Actually I just checked the code and I believe you're right, we do create a subdirectory in the state.dir that includes the app.id. So it doesn't seem unsafe, just unusual. There's no real reason to not allow it anyways (as far as I can tell). As for the problem you describe, it seems like you could just create the state.dir ahead of time and then let each app's subdirectories be created by Streams? > StateDirectory creation fails with Exception > -------------------------------------------- > > Key: KAFKA-8970 > URL: https://issues.apache.org/jira/browse/KAFKA-8970 > Project: Kafka > Issue Type: Bug > Components: streams > Reporter: Nishkam Ravi > Priority: Major > > 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? -- This message was sent by Atlassian Jira (v8.3.4#803005)