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https://issues.apache.org/jira/browse/KAFKA-2636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14955355#comment-14955355
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Gwen Shapira commented on KAFKA-2636:
-------------------------------------
This specific error is in debug level because the KafkaProducer will try
connecting to multiple nodes in its broker-list and retry multiple times before
giving up. We don't want to clutter the log with all the errors on every
network hitch if the produce request was ultimately successful.
Does that make sense?
> Producer connectivity obscured connection failure logging
> ---------------------------------------------------------
>
> Key: KAFKA-2636
> URL: https://issues.apache.org/jira/browse/KAFKA-2636
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.8.2.1, 0.8.2.2
> Environment: Windows 8 running java implementation of Kafka Producer
> Reporter: Jason Kania
>
> The Kafka Producer does not generate a visible exception when a connection
> cannot be made. Instead DEBUG settings are required to observe the problem as
> shown below:
> [2015-10-12 21:23:20,335] DEBUG Error connecting to node 0 at
> 482f4769eed1:9092: (org.apache.kafka.clients.NetworkClient)
> java.io.IOException: Can't resolve address: 482f4769eed1:9092
> at org.apache.kafka.common.network.Selector.connect(Selector.java:138)
> at
> org.apache.kafka.clients.NetworkClient.initiateConnect(NetworkClient.java:417)
> at org.apache.kafka.clients.NetworkClient.ready(NetworkClient.java:116)
> at
> org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:165)
> at
> org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:122)
> at java.lang.Thread.run(Unknown Source)
> Caused by: java.nio.channels.UnresolvedAddressException
> at sun.nio.ch.Net.checkAddress(Unknown Source)
> at sun.nio.ch.SocketChannelImpl.connect(Unknown Source)
> at org.apache.kafka.common.network.Selector.connect(Selector.java:135)
> ... 5 more
> [2015-10-12 21:23:20,358] DEBUG Initiating connection to node 0 at
> 482f4769eed1:9092. (org.apache.kafka.clients.NetworkClient)
> Secondly, the errors do not identify the node by IP address making error
> investigation more difficult especially when learning to use Kafka.
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