Raghu Angadi created BEAM-2551:
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Summary: KafkaIO reader blocks indefinitely if servers are not
reachable
Key: BEAM-2551
URL: https://issues.apache.org/jira/browse/BEAM-2551
Project: Beam
Issue Type: Bug
Components: sdk-java-extensions
Reporter: Raghu Angadi
Assignee: Raghu Angadi
If the KafaIO source reader on the worker can't reach the server, Kafka
consumer blocks forever inside {{UnboundedReader.start()}}. Users have no
indication of the error. It is better if start() fails with an error.
It is easy to reproduce in Kafka. I reported it on Kafka users list here :
https://lists.apache.org/thread.html/98cebefacbd65b0d6c6817fe0b5197e26bc60252e72d05fced91e628@%3Cusers.kafka.apache.org%3E
It blocks inside Kafka client. Fortunately it can be unblocked with
KafkaConsumer.wakeup(). We could run initialization in another thread and
cancel it if takes longer than a minute.
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