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https://issues.apache.org/jira/browse/FLINK-9349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479354#comment-16479354
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Tzu-Li (Gordon) Tai edited comment on FLINK-9349 at 5/17/18 4:46 PM:
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I've just talked offline with Till about this issue.
 We should try to get a fix for this ASAP, but not block 1.5.0 RCs on this 
since it was already a bug in 1.4.0.
 At least we get a fix in soon, so that in case we have to open yet another RC, 
it will be included.


was (Author: tzulitai):
I've just talked offline with Till about this issues.
We should try to get a fix for this ASAP, but not block RCs on this since it 
was already a bug in 1.4.0.
At least we get a fix in soon, so that in case we have to open yet another RC, 
it will be included.

> KafkaConnector Exception  while fetching from multiple kafka topics
> -------------------------------------------------------------------
>
>                 Key: FLINK-9349
>                 URL: https://issues.apache.org/jira/browse/FLINK-9349
>             Project: Flink
>          Issue Type: Bug
>          Components: Kafka Connector
>    Affects Versions: 1.4.0, 1.5.0
>            Reporter: Vishal Santoshi
>            Priority: Critical
>         Attachments: Flink9349Test.java
>
>
> ./flink-connectors/flink-connector-kafka-0.9/src/main/java/org/apache/flink/streaming/connectors/kafka/internal/Kafka09Fetcher.java
>  
> It seems the List subscribedPartitionStates was being modified when 
> runFetchLoop iterated the List.
> This can happen if, e.g., FlinkKafkaConsumer runs the following code 
> concurrently:
>                 kafkaFetcher.addDiscoveredPartitions(discoveredPartitions);
>  
> {code:java}
>  java.util.ConcurrentModificationException
>       at 
> java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:966)
>       at java.util.LinkedList$ListItr.next(LinkedList.java:888)
>       at 
> org.apache.flink.streaming.connectors.kafka.internal.Kafka09Fetcher.runFetchLoop(Kafka09Fetcher.java:134)
> {code}



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