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From "Santhosh G Nayak (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-6792) Allow user's full principal name as owner of MapReduce staging directory in JobSubmissionFiles#JobStagingDir()
Date Thu, 13 Oct 2016 07:10:20 GMT
Santhosh G Nayak created MAPREDUCE-6792:
-------------------------------------------

             Summary: Allow user's full principal name as owner of MapReduce staging directory
in JobSubmissionFiles#JobStagingDir()
                 Key: MAPREDUCE-6792
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6792
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: client
            Reporter: Santhosh G Nayak


Background - 
Currently, {{JobSubmissionFiles#JobStagingDir()}} assumes that file owner returned as part
of {{FileSystem#getFileStatus()}} is always user's short principal name, which is true for
HDFS. But, some file systems which are HDFS compatible like [Azure Data Lake Store (ADLS)
|https://azure.microsoft.com/en-in/services/data-lake-store/] and work in multi tenant environment
can have users with same names belonging to different domains. For example, {{user1@company1.com}}
and {{user1@company2.com}}. It will be ambiguous, if {{FileSystem#getFileStatus()}} returns
only the user's short principal name (without domain name) as the owner of the file/directory.


The following code block allows only short user principal name as owner. It simply fails saying
that ownership on the staging directory is not as expected, if owner returned by the {{FileStatus#getOwner()}}
is not equal to short principal name of the current user.
{code}
    String realUser;
    String currentUser;
    UserGroupInformation ugi = UserGroupInformation.getLoginUser();
    realUser = ugi.getShortUserName();
    currentUser = UserGroupInformation.getCurrentUser().getShortUserName();
    if (fs.exists(stagingArea)) {
      FileStatus fsStatus = fs.getFileStatus(stagingArea);
      String owner = fsStatus.getOwner();
      if (!(owner.equals(currentUser) || owner.equals(realUser))) {
         throw new IOException("The ownership on the staging directory " +
                      stagingArea + " is not as expected. " +
                      "It is owned by " + owner + ". The directory must " +
                      "be owned by the submitter " + currentUser + " or " +
                      "by " + realUser);
      }
	  {code}
The proposal is to remove the strict restriction on short principal name by allowing the user's
full principal name as owner of staging area directory in {{JobSubmissionFiles#JobStagingDir()}}.



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