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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-12755) Spark may attempt to rebuild application UI before finishing writing the event logs in possible race condition
Date Mon, 11 Jan 2016 20:38:39 GMT

     [ https://issues.apache.org/jira/browse/SPARK-12755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-12755:
------------------------------------

    Assignee: Apache Spark

> 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
>            Assignee: Apache Spark
>            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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