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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4439) Error message KafkaConsumer08 when all 'bootstrap.servers' are invalid
Date Mon, 10 Oct 2016 10:29:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15561921#comment-15561921

ASF GitHub Bot commented on FLINK-4439:

Github user rmetzger commented on the issue:

    Yes, I'm still planning to merge it. I was sick the last few weeks, that's why I didn't
proceed. I'm hopefully okay now and I'll try to merge your change today.
    Thank you for rebasing it again.

> Error message KafkaConsumer08 when all 'bootstrap.servers' are invalid
> ----------------------------------------------------------------------
>                 Key: FLINK-4439
>                 URL: https://issues.apache.org/jira/browse/FLINK-4439
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming Connectors
>    Affects Versions: 1.0.3
>            Reporter: Gheorghe Gheorghe
>            Priority: Minor
> The "flink-connector-kafka-0.8_2"  is logging the following error when all 'bootstrap.servers'
are invalid when passed to the FlinkKafkaConsumer08. 
> See stacktrace: 
> {code:title=stacktrace|borderStyle=solid}
> 2016-08-21 15:22:30 WARN  FlinkKafkaConsumerBase:290 - Error communicating with broker
inexistentKafkHost:9092 to find partitions for [testTopic].class java.nio.channels.ClosedChannelException.
Message: null
> 2016-08-21 15:22:30 DEBUG FlinkKafkaConsumerBase:292 - Detailed trace
> java.nio.channels.ClosedChannelException
> 	at kafka.network.BlockingChannel.send(BlockingChannel.scala:100)
> 	at kafka.consumer.SimpleConsumer.liftedTree1$1(SimpleConsumer.scala:78)
> 	at kafka.consumer.SimpleConsumer.kafka$consumer$SimpleConsumer$$sendRequest(SimpleConsumer.scala:68)
> 	at kafka.consumer.SimpleConsumer.send(SimpleConsumer.scala:91)
> 	at kafka.javaapi.consumer.SimpleConsumer.send(SimpleConsumer.scala:68)
> 	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer08.getPartitionsForTopic(FlinkKafkaConsumer08.java:264)
> 	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer08.<init>(FlinkKafkaConsumer08.java:193)
> 	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer08.<init>(FlinkKafkaConsumer08.java:164)
> 	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer08.<init>(FlinkKafkaConsumer08.java:131)
> 	at MetricsFromKafka$.main(MetricsFromKafka.scala:38)
> 	at MetricsFromKafka.main(MetricsFromKafka.scala)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:497)
> 	at sbt.Run.invokeMain(Run.scala:67)
> 	at sbt.Run.run0(Run.scala:61)
> 	at sbt.Run.sbt$Run$$execute$1(Run.scala:51)
> 	at sbt.Run$$anonfun$run$1.apply$mcV$sp(Run.scala:55)
> 	at sbt.Run$$anonfun$run$1.apply(Run.scala:55)
> 	at sbt.Run$$anonfun$run$1.apply(Run.scala:55)
> 	at sbt.Logger$$anon$4.apply(Logger.scala:84)
> 	at sbt.TrapExit$App.run(TrapExit.scala:248)
> 	at java.lang.Thread.run(Thread.java:745)
> {code}
> In the above stackrace it is hard to figure out that the actual servers provided as a
config cannot be resolved to a valid ip address. Moreover the flink kafka consumer will try
all of those servers one by one and failing to get partition information.
> The suggested improvement is to fail fast and announce the user that the servers provided
in the 'boostrap.servers' config are invalid. If at least one server is valid then the exception
should not be thrown. 

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