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https://issues.apache.org/jira/browse/FLINK-9349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479414#comment-16479414
 ] 

ASF GitHub Bot commented on FLINK-9349:
---------------------------------------

Github user tedyu commented on a diff in the pull request:

    https://github.com/apache/flink/pull/6040#discussion_r189036753
  
    --- Diff: 
flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/internals/AbstractFetcher.java
 ---
    @@ -507,7 +507,7 @@ private void updateMinPunctuatedWatermark(Watermark 
nextWatermark) {
                        SerializedValue<AssignerWithPunctuatedWatermarks<T>> 
watermarksPunctuated,
                        ClassLoader userCodeClassLoader) throws IOException, 
ClassNotFoundException {
     
    -           List<KafkaTopicPartitionState<KPH>> partitionStates = new 
LinkedList<>();
    +           List<KafkaTopicPartitionState<KPH>> partitionStates = new 
CopyOnWriteArrayList<>();
    --- End diff --
    
    explanation can be made with a comment.
    No need to link to issue comment.


> 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
>            Assignee: Sergey Nuyanzin
>            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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