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https://issues.apache.org/jira/browse/SPARK-27720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16841325#comment-16841325
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Gabor Somogyi commented on SPARK-27720:
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[~ov7a] Thanks for your efforts and I've had a look on the provided example +
stacktrace.
Not sure why you've called start on the stream itself? (one should call start
on StreamingContext only) Please have a look at the official DStream + Kafka
example
[here|https://github.com/apache/spark/blob/c6a45e6f67abc99d1953d915b96e65a3e2148cf1/examples/src/main/scala/org/apache/spark/examples/streaming/DirectKafkaWordCount.scala#L79].
> 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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