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

["Richard Yu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-7380?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Richard Yu reassigned KAFKA-7380:
---------------------------------

    Assignee: Richard Yu

> 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
>            Assignee: Richard Yu
>            Priority: Minor
>
> 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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