Guozhang Wang created KAFKA-5697:
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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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