Wei-Chiu Chuang created HDFS-14176:
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Summary: 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
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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