Terence Yim created SPARK-13441:
-----------------------------------
Summary: 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: 1.6.0, 1.5.1, 1.4.1
Reporter: Terence Yim
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 chown 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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