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https://issues.apache.org/jira/browse/SPARK-22976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16329400#comment-16329400
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Apache Spark commented on SPARK-22976:
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User 'RussellSpitzer' has created a pull request for this issue:
https://github.com/apache/spark/pull/20298
> Worker cleanup can remove running driver directories
> ----------------------------------------------------
>
> Key: SPARK-22976
> URL: https://issues.apache.org/jira/browse/SPARK-22976
> Project: Spark
> Issue Type: Bug
> Components: Deploy, Spark Core
> Affects Versions: 1.0.2
> Reporter: Russell Spitzer
> Priority: Major
>
> Spark Standalone worker cleanup finds directories to remove with a listFiles
> command
> This includes both application directories and driver directories from
> cluster mode submitted applications.
> A directory is considered to not be part of a running app if the worker does
> not have an executor with a matching ID.
> https://github.com/apache/spark/blob/v2.2.1/core/src/main/scala/org/apache/spark/deploy/worker/Worker.scala#L432
> {code}
> val appIds = executors.values.map(_.appId).toSet
> val isAppStillRunning = appIds.contains(appIdFromDir)
> {code}
> If a driver has been started on a node, but all of the executors are on other
> nodes, the worker running the driver will always assume that the driver
> directory is not part of a running app.
> Consider a two node spark cluster with Worker A and Worker B where each node
> has a single core available. We submit our application in deploy mode
> cluster, the driver begins running on Worker A while the Executor starts on B.
> Worker A has a cleanup triggered and looks and finds it has a directory
> {code}
> /var/lib/spark/worker/driver-20180105234824-0000
> {code}
> Worker A check's it's executor list and finds no entries which match this
> since it has no corresponding executors for this application. Worker A then
> removes the directory even though it may still be actively running.
> I think this could be fixed by modifying line 432 to be
> {code}
> val appIds = executors.values.map(_.appId).toSet ++
> drivers.values.map(_.driverId)
> {code}
> I'll run a test and submit a PR soon.
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