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From "Guozhang Wang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-5697) StreamThread.close() need to interrupt the stream threads to break the loop
Date Thu, 03 Aug 2017 22:32:00 GMT
Guozhang Wang created KAFKA-5697:
------------------------------------

             Summary: 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


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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