[GitHub] spark pull request #19121: [SPARK-21906][YARN][Spark Core]Don't runAsSparkUs...

[yaooqinn]

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?
    
    1、The Yarn application‘s ugi is determined by the ugi launching it
    2、 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 <yaooq...@hotmail.com>
Date:   2017-09-04T08:57:23Z

    not switch ugi to itself

----


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