[jira] [Resolved] (SPARK-19182) Optimize the lock in StreamingJobProgressListener to not block UI when generating Streaming jobs

["Shixiong Zhu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-19182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shixiong Zhu resolved SPARK-19182.
----------------------------------
       Resolution: Fixed
         Assignee: Genmao Yu
    Fix Version/s: 2.2.0

> 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
>            Assignee: Genmao Yu
>            Priority: Minor
>             Fix For: 2.2.0
>
>
> 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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