[jira] [Commented] (HDFS-14176) Replace incorrect use of system property user.name

["Wei-Chiu Chuang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-14176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16732321#comment-16732321 ] 

Wei-Chiu Chuang commented on HDFS-14176:
----------------------------------------

Thank you for the detailed analysis! That looks reasonable to me.

> Replace incorrect use of system property user.name
> --------------------------------------------------
>
>                 Key: HDFS-14176
>                 URL: https://issues.apache.org/jira/browse/HDFS-14176
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.3.0
>         Environment: Kerberized
>            Reporter: Wei-Chiu Chuang
>            Assignee: Dinesh Chitlangia
>            Priority: Major
>
> Looking at the Hadoop source code, there are a few places where the code assumes the user name can be acquired from Java's system property {{user.name}}.
> For example,
> {code:java|title=FileSystem}
> /** Return the current user's home directory in this FileSystem.
>    * The default implementation returns {@code "/user/$USER/"}.
>    */
>   public Path getHomeDirectory() {
>     return this.makeQualified(
>         new Path(USER_HOME_PREFIX + "/" + System.getProperty("user.name")));
>   }
> {code}
> This is incorrect, as in a Kerberized environment, a user may login as a user principal different from its system login account.
> It would be better to use {{UserGroupInformation.getCurrentUser().getShortUserName()}}, similar to HDFS-12485.
> Unfortunately, I am seeing this improper use in Yarn, HDFS federation SFTPFilesystem and Ozone code (tests are ignored)
> The impact should be small, since it only affects the case where system is Kerberized and that the user principal is different from system login account.



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