Sendoh created FLINK-5368:
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             Summary: Let Kafka consumer show something when it fails to read 
one topic out of topic list
                 Key: FLINK-5368
                 URL: https://issues.apache.org/jira/browse/FLINK-5368
             Project: Flink
          Issue Type: Improvement
          Components: Kafka Connector
            Reporter: Sendoh
            Assignee: Sendoh
            Priority: Minor


As a developer when reading data from many topics, I want Kafka consumer to 
throw Exception or LOG.error() if any topic is not available. The motivation is 
we read many topics as list at one time, and sometimes we fail to recognize 
that one or two topics' names have been changed or deprecated, and Flink Kafka 
connector doesn't show the error.

My proposed change would be either to throw RunTimeError or to use 
log.Error(topic + "doesn't have any partition") if partitionsForTopic is null 
at this function. 
https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-kafka-0.9/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumer09.java#L208

Any suggestion is welcome.



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