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https://issues.apache.org/jira/browse/FLINK-9349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16488878#comment-16488878
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Piotr Nowojski commented on FLINK-9349:
---------------------------------------
Because of cancelled 1.5.0 RC5 this fix will make it to 1.5.0 RC6. FYI
[~tzulitai] you might want to run some additional tests for 1.5.0 RC6 to make
sure that everything works as expected, because this bug fix was not included
in normal release testing, and a lot of voters will probably just carry over
their votes to new RC without testing RC6.
> 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
> Reporter: Vishal Santoshi
> Assignee: Sergey Nuyanzin
> Priority: Critical
> Fix For: 1.5.0, 1.4.3
>
> 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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