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https://issues.apache.org/jira/browse/KAFKA-3637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15304171#comment-15304171
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Eno Thereska commented on KAFKA-3637:
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Hi [~tszym]. I just added a method that might help with that as part of
https://github.com/apache/kafka/pull/1422.
> Add method that checks if streams are initialised
> -------------------------------------------------
>
> Key: KAFKA-3637
> URL: https://issues.apache.org/jira/browse/KAFKA-3637
> Project: Kafka
> Issue Type: Sub-task
> Components: streams
> Affects Versions: 0.10.1.0
> Reporter: Eno Thereska
> Assignee: Liquan Pei
> Labels: newbie
> Fix For: 0.10.1.0
>
>
> Currently when streams are initialised and started with streams.start(),
> there is no way for the caller to know if the initialisation procedure
> (including starting tasks) is complete or not. Hence, the caller is forced to
> guess for how long to wait. It would be good to have a way to return the
> state of the streams to the caller.
> One option would be to follow a similar approach in Kafka Server
> (BrokerStates.scala).
> As part of this change, we must remove the Thread.sleep() call in the Kafka
> Streams integration tests and substitute it with TestUtils.waitUntilTrue().
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