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https://issues.apache.org/jira/browse/SPARK-12755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15092645#comment-15092645
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Apache Spark commented on SPARK-12755:
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User 'mallman' has created a pull request for this issue:
https://github.com/apache/spark/pull/10700
> Spark may attempt to rebuild application UI before finishing writing the
> event logs in possible race condition
> --------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-12755
> URL: https://issues.apache.org/jira/browse/SPARK-12755
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.5.2
> Reporter: Michael Allman
> Priority: Minor
>
> As reported in SPARK-6950, it appears that sometimes the standalone master
> attempts to build an application's historical UI before closing the app's
> event log. This is still an issue for us in 1.5.2+, and I believe I've found
> the underlying cause.
> When stopping a {{SparkContext}}, the {{stop}} method stops the DAG scheduler:
> https://github.com/apache/spark/blob/a76cf51ed91d99c88f301ec85f3cda1288bcf346/core/src/main/scala/org/apache/spark/SparkContext.scala#L1722-L1727
> and then stops the event logger:
> https://github.com/apache/spark/blob/a76cf51ed91d99c88f301ec85f3cda1288bcf346/core/src/main/scala/org/apache/spark/SparkContext.scala#L1722-L1727
> Though it is difficult to follow the chain of events, one of the sequelae of
> stopping the DAG scheduler is that the master's {{rebuildSparkUI}} method is
> called. This method looks for the application's event logs, and its behavior
> varies based on the existence of an {{.inprogress}} file suffix. In
> particular, a warning is logged if this suffix exists:
> https://github.com/apache/spark/blob/a76cf51ed91d99c88f301ec85f3cda1288bcf346/core/src/main/scala/org/apache/spark/deploy/master/Master.scala#L935
> After calling the {{stop}} method on the DAG scheduler, the {{SparkContext}}
> stops the event logger:
> https://github.com/apache/spark/blob/a76cf51ed91d99c88f301ec85f3cda1288bcf346/core/src/main/scala/org/apache/spark/SparkContext.scala#L1734-L1736
> This renames the event log, dropping the {{.inprogress}} file sequence.
> As such, a race condition exists where the master may attempt to process the
> application log file before finalizing it.
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