Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/7069#discussion_r33498897
--- Diff: core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala
---
@@ -334,6 +334,17 @@ class SparkHadoopUtil extends Logging {
* Stop the thread that does the delegation token updates.
*/
private[spark] def stopExecutorDelegationTokenRenewer() {}
+
+ /**
+ * Disable the hadoop fs cache mechanism, otherwise DFSClient will use
old token to connect nn.
--- End diff --
also this java doc doesn't really describe what this method does. You need
something like:
```
Return a fresh Hadoop configuration, bypassing the HDFS cache mechanism.
This is to prevent the DFSClient from using an old cached token to connect
to the NameNode.
```
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