[jira] [Created] (KAFKA-12707) KafkaProducer should have a clearer error message on sasl.mechanism misconfiguration

["Rohan Desai (Jira)" <ji...@apache.org>]

Rohan Desai created KAFKA-12707:
-----------------------------------

             Summary: KafkaProducer should have a clearer error message on sasl.mechanism misconfiguration
                 Key: KAFKA-12707
                 URL: https://issues.apache.org/jira/browse/KAFKA-12707
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 3.0.0
            Reporter: Rohan Desai


Not sure if this is producer-specific, but I accidentally configured my producer by setting:

```

sasl.mechanism=plain

```

instead of 

```

sasl.mechanism=PLAIN

```

 

When I did this, the producer just hangs and logs in a loop like this, which isn't very informative:
[2021-04-21 21:33:20,519] WARN [Producer clientId=producer-1] Bootstrap broker pkc-g91q1.us-west-2.aws.stag.cpdev.cloud:9092 (id: -1 rack: null) disconnected (org.apache.kafka.clients.NetworkClient:1050)
[2021-04-21 21:33:21,584] INFO [Producer clientId=producer-1] Failed to create channel due to  (org.apache.kafka.common.network.SaslChannelBuilder:239)
org.apache.kafka.common.errors.SaslAuthenticationException: Failed to configure SaslClientAuthenticator
Caused by: org.apache.kafka.common.errors.SaslAuthenticationException: Failed to create SaslClient with mechanism plain
[2021-04-21 21:33:21,584] WARN [Producer clientId=producer-1] Error connecting to node pkc-g91q1.us-west-2.aws.stag.cpdev.cloud:9092 (id: -1 rack: null) (org.apache.kafka.clients.NetworkClient:982)
java.io.IOException: Channel could not be created for socket java.nio.channels.SocketChannel[closed]
	at org.apache.kafka.common.network.Selector.buildAndAttachKafkaChannel(Selector.java:348)
	at org.apache.kafka.common.network.Selector.registerChannel(Selector.java:329)
	at org.apache.kafka.common.network.Selector.connect(Selector.java:256)
	at org.apache.kafka.clients.NetworkClient.initiateConnect(NetworkClient.java:977)
	at org.apache.kafka.clients.NetworkClient.access$600(NetworkClient.java:73)
	at org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:1148)
	at org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:1036)
	at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:549)
	at org.apache.kafka.clients.producer.internals.Sender.runOnce(Sender.java:328)
	at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:243)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.kafka.common.KafkaException: org.apache.kafka.common.errors.SaslAuthenticationException: Failed to configure SaslClientAuthenticator
	at org.apache.kafka.common.network.SaslChannelBuilder.buildChannel(SaslChannelBuilder.java:240)
	at org.apache.kafka.common.network.Selector.buildAndAttachKafkaChannel(Selector.java:338)
	... 10 more
Caused by: org.apache.kafka.common.errors.SaslAuthenticationException: Failed to configure SaslClientAuthenticator
Caused by: org.apache.kafka.common.errors.SaslAuthenticationException: Failed to create SaslClient with mechanism plain
[2021-04-21 21:33:21,584] WARN [Producer clientId=producer-1] Bootstrap broker pkc-g91q1.us-west-2.aws.stag.cpdev.cloud:9092 (id: -1 rack: null) disconnected (org.apache.kafka.clients.NetworkClient:1050)
 

It would be better to early-exit with a clear error message



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