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https://issues.apache.org/jira/browse/SPARK-13693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15258867#comment-15258867
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Josh Rosen commented on SPARK-13693:
------------------------------------
I think that I've spotted the race:
If the stopping thread enters the synchronized block in
{{CheckpointWriter.stop()}}, it will block the writer thread, who needs to
synchronize on the same lock to access {{fs}}.
> Flaky test: o.a.s.streaming.MapWithStateSuite
> ---------------------------------------------
>
> Key: SPARK-13693
> URL: https://issues.apache.org/jira/browse/SPARK-13693
> Project: Spark
> Issue Type: Test
> Components: Tests
> Reporter: Shixiong Zhu
> Assignee: Shixiong Zhu
> Priority: Minor
> Fix For: 2.0.0
>
>
> Fixed the following flaky test:
> https://amplab.cs.berkeley.edu/jenkins/job/spark-master-test-sbt-hadoop-2.7/256/testReport/junit/org.apache.spark.streaming/MapWithStateSuite/_It_is_not_a_test_/
> {code}
> sbt.ForkMain$ForkError: java.io.IOException: Failed to delete:
> /home/jenkins/workspace/spark-master-test-sbt-hadoop-2.7/streaming/checkpoint/spark-e97794a8-b940-4b21-8685-bf1221f9444d
> at org.apache.spark.util.Utils$.deleteRecursively(Utils.scala:934)
> at
> org.apache.spark.streaming.MapWithStateSuite$$anonfun$2.apply$mcV$sp(MapWithStateSuite.scala:47)
> at
> org.apache.spark.streaming.MapWithStateSuite$$anonfun$2.apply(MapWithStateSuite.scala:45)
> at
> org.apache.spark.streaming.MapWithStateSuite$$anonfun$2.apply(MapWithStateSuite.scala:45)
> {code}
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