GitHub user yaooqinn opened a pull request:
https://github.com/apache/spark/pull/19121
[SPARK-21906][YARN][Spark Core]Don't runAsSparkUser to switch
UserGroupInformation in YARN mode
## What changes were proposed in this pull request?
1ãThe Yarn applicationâs ugi is determined by the ugi launching it
2ã runAsSparkUser is used to switch a ugi as same as itself, because we
have already set
`env("SPARK_USER") =
UserGroupInformation.getCurrentUser().getShortUserName() `
in the am container context
```scala
def runAsSparkUser(func: () => Unit) {
val user = Utils.getCurrentUserName() // get the user itself
logDebug("running as user: " + user)
val ugi = UserGroupInformation.createRemoteUser(user) // create a new
ugi use itself
transferCredentials(UserGroupInformation.getCurrentUser(), ugi) //
transfer its own credentials
ugi.doAs(new PrivilegedExceptionAction[Unit] { // doAs as itseft
def run: Unit = func()
})
}
```
## How was this patch tested?
manual tests
cc @vanzin
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yaooqinn/spark SPARK-21906
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19121.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #19121
commit 5745f2a9f0537487e554131711b7b5f9bb26d53b
Author: Kent Yao
Date: 2017-09-04T08:57:23Z
not switch ugi to itself
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