Richard Wise created KAFKA-9271:
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Summary: Client hangs until timeout when SSL handshake fails
Key: KAFKA-9271
URL: https://issues.apache.org/jira/browse/KAFKA-9271
Project: Kafka
Issue Type: Bug
Components: clients
Affects Versions: 2.0.1
Reporter: Richard Wise
I accidentally forgot to set `security.protocol` to `SSL`, which meant that the
Kafka client tried connecting to an SSL port via PLAINTEXT. I would expect this
to immediate fail on the client side with an obvious message that the security
settings do not match the server. However, instead the client continually
retries (I can see the SSL handshake failure messages in the server logs)
before timing out on querying metadata.
This behaviour is confusing and leads the developer to think that there is an
issue of latency or load and that they need to increase hardware or timeouts.
In addition, the continual retries (without any backoff) cause significant CPU
load on both the client and server that can cause additional issues.
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