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https://issues.apache.org/jira/browse/SPARK-13441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sean Owen resolved SPARK-13441.
-------------------------------
Resolution: Fixed
Fix Version/s: 1.6.2
2.0.0
Issue resolved by pull request 11337
[https://github.com/apache/spark/pull/11337]
> NullPointerException when either HADOOP_CONF_DIR or YARN_CONF_DIR is not
> readable
> ---------------------------------------------------------------------------------
>
> Key: SPARK-13441
> URL: https://issues.apache.org/jira/browse/SPARK-13441
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Affects Versions: 1.4.1, 1.5.1, 1.6.0
> Reporter: Terence Yim
> Fix For: 2.0.0, 1.6.2
>
>
> NPE is throw from the yarn Client.scala because {{File.listFiles()}} can
> return null on directory that it doesn't have permission to list. This is the
> code fragment in question:
> {noformat}
> // In org/apache/spark/deploy/yarn/Client.scala
> Seq("HADOOP_CONF_DIR", "YARN_CONF_DIR").foreach { envKey =>
> sys.env.get(envKey).foreach { path =>
> val dir = new File(path)
> if (dir.isDirectory()) {
> // dir.listFiles() can return null
> dir.listFiles().foreach { file =>
> if (file.isFile && !hadoopConfFiles.contains(file.getName())) {
> hadoopConfFiles(file.getName()) = file
> }
> }
> }
> }
> }
> {noformat}
> To reproduce, simply do:
> {noformat}
> sudo mkdir /tmp/conf
> sudo chmod 700 /tmp/conf
> export HADOOP_CONF_DIR=/etc/hadoop/conf
> export YARN_CONF_DIR=/tmp/conf
> spark-submit --master yarn-client SimpleApp.py
> {noformat}
> It fails on any Spark app. Though not important, the SimpleApp.py I used
> looks like this:
> {noformat}
> from pyspark import SparkContext
> sc = SparkContext(None, "Simple App")
> data = [1, 2, 3, 4, 5]
> distData = sc.parallelize(data)
> total = distData.reduce(lambda a, b: a + b)
> print("Total: %i" % total)
> {noformat}
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