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https://issues.apache.org/jira/browse/SPARK-27720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16843966#comment-16843966
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ov7a commented on SPARK-27720:
------------------------------

In MWE the problem disappears, yes. In my app the problem did not appear 
(yet?). I think the issue can be closed. 
Can it be reopened later (just in case)?

> ConcurrentModificationException on operating with DirectKafkaInputDStream
> -------------------------------------------------------------------------
>
>                 Key: SPARK-27720
>                 URL: https://issues.apache.org/jira/browse/SPARK-27720
>             Project: Spark
>          Issue Type: Bug
>          Components: DStreams
>    Affects Versions: 2.4.1, 2.4.3
>            Reporter: ov7a
>            Priority: Minor
>
> If a DirectKafkaInputDStream is started in one thread and is being stopped in 
> another thread (e.g. by shutdown hook) a 
> java.util.ConcurrentModificationException (KafkaConsumer is not safe for 
> multi-threaded access) is thrown.
> This happens even if "spark.streaming.kafka.consumer.cache.enabled" is set to 
> "false".
> MWE: https://gist.github.com/ov7a/fc783315ea252a03d51804ce326a13b1
>  



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