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https://issues.apache.org/jira/browse/SPARK-21078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16048814#comment-16048814
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Sean Owen commented on SPARK-21078:
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OK [~ffbin] would you like to work on the change I suggest above?
> JobHistory applications synchronized is invalid
> -----------------------------------------------
>
> Key: SPARK-21078
> URL: https://issues.apache.org/jira/browse/SPARK-21078
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.1.1
> Reporter: fangfengbin
>
> FsHistoryProvider has some threads to mergeApplicationListing.
> mergeApplicationListing function has code like this:
> applications.synchronized {
> ...
> applications = mergedApps
> ...
> }
> applications object is changed, so the synchronized do not work.
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