Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/13738#discussion_r67876187
--- Diff: core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala
---
@@ -421,6 +421,13 @@ object SparkHadoopUtil {
val SPARK_YARN_CREDS_COUNTER_DELIM = "-"
+ // Just load HdfsConfiguration into the class loader to add
+ // hdfs-site.xml as a default configuration file otherwise
+ // some HDFS related configurations doesn't ship to Executors and
+ // it can cause UnknownHostException when NameNode HA is enabled.
+ // See SPARK-11227 for more details.
+ Utils.classForName("org.apache.hadoop.hdfs.HdfsConfiguration")
--- End diff --
actually I'd prefer not to reference hdfs-site.xml directly.
HdfsConfiguration should know what it needs to load. For instance it also
loads the defaults. HdfsConfiguration is also marked as
@InterfaceAudience.Private so ideally we shouldn't be using it directly.
Based on my other comments I would like to understand better why this isn't
loaded on driver already.
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