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https://issues.apache.org/jira/browse/SPARK-27720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16840487#comment-16840487
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Gabor Somogyi commented on SPARK-27720:
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Now I see the places where the consumer usage is not protected with
this.synchronized.
> ConcurrentModificationException on closing 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
> 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".
>
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