GitHub user jedichien opened a pull request:
https://github.com/apache/kafka/pull/2924
change connection refused message from level DEBUG into WARN.
If broker is down, we supply logging message to let user know
`java.net.ConnectException: Connection refused` but not should be debug message
because in normal situation user may not set logging level with **INFO** or
**WARN** but not **DEBUG**.
```
2017-04-27 15:54:47,759 DEBUG [org.apache.kafka.common.network.Selector] -
Connection with localhost/127.0.0.1 disconnected
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
at
org.apache.kafka.common.network.PlaintextTransportLayer.finishConnect(PlaintextTransportLayer.java:50)
at
org.apache.kafka.common.network.KafkaChannel.finishConnect(KafkaChannel.java:80)
at
org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:339)
at org.apache.kafka.common.network.Selector.poll(Selector.java:307)
at
org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:359)
at
org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:230)
at
org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:206)
at
org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:197)
at
org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.awaitMetadataUpdate(ConsumerNetworkClient.java:132)
at
org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureCoordinatorReady(AbstractCoordinator.java:223)
at
org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureCoordinatorReady(AbstractCoordinator.java:200)
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:285)
at
org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:1037)
at
org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1002)
at com.kafka.Test.main(Test.java:27)
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jedichien/kafka trunk
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/2924.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2924
----
commit da4bcbaa90ed2107128914f7d6ca92add6e616db
Author: jameschien <jamesch...@staff.ruten.com.tw>
Date: 2017-04-27T08:00:20Z
change connection refused message from level DEBUG into WARN.
----
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