Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/17870#discussion_r114972572
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/security/HDFSCredentialProvider.scala
---
@@ -75,8 +84,15 @@ private[security] class HDFSCredentialProvider extends
ServiceCredentialProvider
sparkConf.get(PRINCIPAL).flatMap { renewer =>
val creds = new Credentials()
nnsToAccess(hadoopConf, sparkConf).foreach { dst =>
- val dstFs = dst.getFileSystem(hadoopConf)
- dstFs.addDelegationTokens(renewer, creds)
+ try {
+ val dstFs = dst.getFileSystem(hadoopConf)
+ dstFs.addDelegationTokens(renewer, creds)
+ } catch {
+ case e: StandbyException =>
+ logWarning(s"Namenode ${dst} is in state standby", e)
+ case e: RemoteException =>
+ logWarning(s"Namenode ${dst} is in state standby", e)
+ }
--- End diff --
HADOOP-13372 implies that swift:// throws an UnknownHostException here;
best to catch & log too, in case someone adds swift:// to the list of
filesystems.
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