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Posted to dev@kafka.apache.org by "Matthias J. Sax (JIRA)" <ji...@apache.org> on 2018/09/06 00:25:00 UTC

[jira] [Created] (KAFKA-7380) Global thread restore blocks KafkaStreams#start()

Matthias J. Sax created KAFKA-7380:
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             Summary: Global thread restore blocks KafkaStreams#start()
                 Key: KAFKA-7380
                 URL: https://issues.apache.org/jira/browse/KAFKA-7380
             Project: Kafka
          Issue Type: Bug
          Components: streams
            Reporter: Matthias J. Sax


KafkaStreams#start() is documented to be non-blocking and should return immediately. However, if global stores are used, `start()` blocks until all global stores are restored.

We should change this and start all threads at the same time while all StreamThread would to go `wait()` state on startup immediately, and only resume after global thread restore finishes and `wakeup()` all StreamThreads. 



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