[jira] [Created] (SPARK-12775) Couldn't find leader offsets exception when hostname can't be resolved

["Sebastian Piu (JIRA)" <ji...@apache.org>]

Sebastian Piu created SPARK-12775:
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             Summary: Couldn't find leader offsets exception when hostname can't be resolved
                 Key: SPARK-12775
                 URL: https://issues.apache.org/jira/browse/SPARK-12775
             Project: Spark
          Issue Type: Bug
          Components: Streaming
    Affects Versions: 1.6.0
            Reporter: Sebastian Piu
            Priority: Minor


When hostname resolution fails for a broker an unclear/misleading error is shown:

org.apache.spark.SparkException: java.nio.channels.ClosedChannelException
org.apache.spark.SparkException: Couldn't find leader offsets for Set([mytopic,0], [mytopic,18], [mytopic,12], [mytopic,6])

	at org.apache.spark.streaming.kafka.KafkaCluster$$anonfun$checkErrors$1.apply(KafkaCluster.scala:366)
	at org.apache.spark.streaming.kafka.KafkaCluster$$anonfun$checkErrors$1.apply(KafkaCluster.scala:366)

Error above ocurred when a broker was added to the cluster and my machine could not resolve its hostname



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