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https://issues.apache.org/jira/browse/SPARK-21223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16064406#comment-16064406
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Apache Spark commented on SPARK-21223:
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User 'zenglinxi0615' has created a pull request for this issue:
https://github.com/apache/spark/pull/18430
> Thread-safety issue in FsHistoryProvider
> -----------------------------------------
>
> Key: SPARK-21223
> URL: https://issues.apache.org/jira/browse/SPARK-21223
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.1.1
> Reporter: zenglinxi
>
> Currently, Spark HistoryServer use a HashMap named fileToAppInfo in class
> FsHistoryProvider to store the map of eventlog path and attemptInfo.
> When use ThreadPool to Replay the log files in the list and merge the list of
> old applications with new ones, multi thread may update fileToAppInfo at the
> same time, which may cause Thread-safety issues.
> {code:java}
> for (file <- logInfos) {
> tasks += replayExecutor.submit(new Runnable {
> override def run(): Unit = mergeApplicationListing(file)
> })
> }
> {code}
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