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https://issues.apache.org/jira/browse/SPARK-19182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15823663#comment-15823663
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Apache Spark commented on SPARK-19182:
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User 'uncleGen' has created a pull request for this issue:
https://github.com/apache/spark/pull/16601
> Optimize the lock in StreamingJobProgressListener to not block UI when
> generating Streaming jobs
> ------------------------------------------------------------------------------------------------
>
> Key: SPARK-19182
> URL: https://issues.apache.org/jira/browse/SPARK-19182
> Project: Spark
> Issue Type: Improvement
> Components: DStreams
> Reporter: Shixiong Zhu
> Priority: Minor
>
> When DStreamGraph is generating a job, it will hold a lock and block other
> APIs. Because StreamingJobProgressListener (numInactiveReceivers,
> streamName(streamId: Int), streamIds) needs to call DStreamGraph's methods to
> access some information, the UI may hang if generating a job is very slow
> (e.g., talking to the slow Kafka cluster to fetch metadata).
> It's better to optimize the locks in DStreamGraph and
> StreamingJobProgressListener to make the UI not block by job generation.
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