02tmqrmje9 created KAFKA-7113:
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Summary: AdminClient.create has an infinite retry loop bug
Key: KAFKA-7113
URL: https://issues.apache.org/jira/browse/KAFKA-7113
Project: Kafka
Issue Type: Bug
Reporter: 02tmqrmje9
When you try to instantiate an KafkaAdminClient using the factory method
AdminClient.create it returns a client while side-effecting with a background
thread stuck in a retry loop forever attempting to get broker metadata when
brokers are not accessible.
Running the below code:
{code:java}
val props = new Properties()
props.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:8080)
AdminClient.create(props)
{code}
Will result in an endless loop of the below forever:
{code:java}
Connection to node -1 could not be established. Broker may not be available
{code}
As create returns an AdminClient value straight away and forks to a background
thread there is no way to know if the client instantiated successfully or not
and to handle the error case.
* Calling create ideally should not side affect as it's equivalent to a
side-effecting constructor
* At the least calling create should fatally fail if it can't talk to the
brokers so the error case can be handled, i.e so a user can fail fast and
propagate errors.
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