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ASF GitHub Bot commented on FLINK-4439: --------------------------------------- Github user gheo21 commented on the issue: https://github.com/apache/flink/pull/2397 Hi @rmetzger, Thanks for the update, np. > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)