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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-6792) Allow user's full principal name as owner of MapReduce staging directory in JobSubmissionFiles#JobStagingDir()
Date Thu, 13 Oct 2016 12:08:20 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-6792?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Junping Du updated MAPREDUCE-6792:
----------------------------------
    Status: Patch Available  (was: Open)

Submit the patch for kick off Jenkins' test.
The patch looks good in overall. Several comments:
1. {{fileOwner.equalsIgnoreCase(currentUser.getUserName())}} - I think our current assumption
in hadoop is user name should be case sensitive, so user and USER are treated as different
user. In AzureFS or other similar cloud based FS, do we change the assumption here especially
for domain name? If not, we should keep case sensitive check here.
2. The exception message include all possible usernames, it could be duplicated in case login
user = real user (in case no proxy user get used). So we should do a quick check and only
log both when login user != real user. Isn't it?
3. It would be great if we can figure out some way to add unit test for use case that we are
adding here.

> 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
>            Assignee: Santhosh G Nayak
>         Attachments: MAPREDUCE-6792.1.patch
>
>
> 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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