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https://issues.apache.org/jira/browse/SPARK-5492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14298075#comment-14298075
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Patrick Wendell commented on SPARK-5492:
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/cc [~sandyr]
> Thread statistics can break with older Hadoop versions
> ------------------------------------------------------
>
> Key: SPARK-5492
> URL: https://issues.apache.org/jira/browse/SPARK-5492
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Reporter: Patrick Wendell
> Priority: Blocker
>
> {code}
> java.lang.ClassNotFoundException:
> org.apache.hadoop.fs.FileSystem$Statistics$StatisticsData
> at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:191)
> at
> org.apache.spark.deploy.SparkHadoopUtil.getFileSystemThreadStatisticsMethod(SparkHadoopUtil.scala:180)
> at
> org.apache.spark.deploy.SparkHadoopUtil.getFSBytesReadOnThreadCallback(SparkHadoopUtil.scala:139)
> at
> org.apache.spark.rdd.NewHadoopRDD$$anon$1$$anonfun$2.apply(NewHadoopRDD.scala:120)
> at
> org.apache.spark.rdd.NewHadoopRDD$$anon$1$$anonfun$2.apply(NewHadoopRDD.scala:118)
> at scala.Option.orElse(Option.scala:257)
> {code}
> I think the issue is we need to catch ClassNotFoundException here:
> https://github.com/apache/spark/blob/b1b35ca2e440df40b253bf967bb93705d355c1c0/core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala#L144
> However, I'm really confused how this didn't fail our unit tests, since we
> explicitly tried to test this.
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