Github user wangyum commented on the issue:
https://github.com/apache/spark/pull/21734
It will spend a lot of time to fetch tokens. I add some print at
`HadoopFSDelegationTokenProvider`:
```scala
filesystems.foreach { fs =>
try {
logInfo("getting token for: " + fs)
logWarning("begin")
fs.addDelegationTokens(renewer, creds)
logWarning("end")
} catch {
case _: ConnectTimeoutException =>
logError(s"Failed to fetch Delegation Tokens.")
case e: Throwable =>
logError("Error while fetch Delegation Tokens.", e)
}
}
```
This is the [log
file](https://github.com/apache/spark/files/2178613/log.txt).
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