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https://issues.apache.org/jira/browse/HDFS-14176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16797494#comment-16797494
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Dinesh Chitlangia commented on HDFS-14176:
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Thanks [~ajayydv] for commit and [~jojochuang] for review/guidance.
> 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
> Attachments: HDFS-14176.01.patch, HDFS-14176.02.patch,
> HDFS-14176.03.patch, HDFS-14176.04.patch
>
>
> 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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