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From "Guozhang Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5697) StreamThread.close() need to interrupt the stream threads to break the loop
Date Mon, 11 Dec 2017 05:53:01 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16285540#comment-16285540
] 

Guozhang Wang commented on KAFKA-5697:
--------------------------------------

[~johnma] are you still working on this ticket?

> StreamThread.close() need to interrupt the stream threads to break the loop
> ---------------------------------------------------------------------------
>
>                 Key: KAFKA-5697
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5697
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: Guozhang Wang
>            Assignee: Mariam John
>
> In {{StreamThread.close()}} we currently do nothing but set the state, hoping the stream
thread may eventually check it and shutdown itself. However, under certain scenarios the thread
may get blocked within a single loop and hence will never check on this state enum. For example,
it's {{consumer.poll}} call trigger {{ensureCoordinatorReady()}} which will block until the
coordinator can be found. If the coordinator broker is never up and running then the Stream
instance will be blocked forever.
> A simple way to produce this issue is to start the work count demo without starting the
ZK / Kafka broker, and then it will get stuck in a single loop and even `ctrl-C` will not
stop it since its set state will never be read by the thread:
> {code}
> [2017-08-03 15:17:39,981] WARN Connection to node -1 could not be established. Broker
may not be available. (org.apache.kafka.clients.NetworkClient)
> [2017-08-03 15:17:40,046] WARN Connection to node -1 could not be established. Broker
may not be available. (org.apache.kafka.clients.NetworkClient)
> [2017-08-03 15:17:40,101] WARN Connection to node -1 could not be established. Broker
may not be available. (org.apache.kafka.clients.NetworkClient)
> [2017-08-03 15:17:40,206] WARN Connection to node -1 could not be established. Broker
may not be available. (org.apache.kafka.clients.NetworkClient)
> [2017-08-03 15:17:40,261] WARN Connection to node -1 could not be established. Broker
may not be available. (org.apache.kafka.clients.NetworkClient)
> [2017-08-03 15:17:40,366] WARN Connection to node -1 could not be established. Broker
may not be available. (org.apache.kafka.clients.NetworkClient)
> [2017-08-03 15:17:40,472] WARN Connection to node -1 could not be established. Broker
may not be available. (org.apache.kafka.clients.NetworkClient)
> ^C[2017-08-03 15:17:40,580] WARN Connection to node -1 could not be established. Broker
may not be available. (org.apache.kafka.clients.NetworkClient)
> {code}



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