Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/13738#discussion_r67813873
--- 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 --
Just reference it in any way, but, I guess we should ask, what does
classloading do that we need, and is there any way to do that directly? this is
fairly indirect. Is it that `
Configuration.addDefaultResource("hdfs-site.xml");` must be called?
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