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https://issues.apache.org/jira/browse/HADOOP-10018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13786510#comment-13786510
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Haohui Mai commented on HADOOP-10018:
-------------------------------------
I believe that the Shell class will need a valid directory in order to ensure
that getcwd() succeeds. That's the reason why hadoop.home.dir needs to be set
to a valid path.
it might not be a good idea to depend on java properties or environment
variables. For example, using the environment variable HADOOP_HOME causes this
bug. Similar issues might arise for properties like user.home -- I'm unfamiliar
with the partsof JDK specifications that specify that user.home has to be a
valid path (in fact it might not be, due to bugs in JDK:
http://stackoverflow.com/questions/2134338/java-user-home-is-being-set-to-userprofile-and-not-being-resolved).
Notice that simply setting it to "/" won't work either due to Windows
compatibility.
I agree that setting to a temporary directory is imperfect, but compared to
alternative approaches it seems this one is slightly more robust and more
platform neutral.
> TestUserGroupInformation throws NPE when HADOOP_HOME is not set
> ---------------------------------------------------------------
>
> Key: HADOOP-10018
> URL: https://issues.apache.org/jira/browse/HADOOP-10018
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Haohui Mai
> Assignee: Haohui Mai
> Priority: Minor
> Attachments: HADOOP-10018.000.patch
>
>
> TestUserGroupInformation throws NPE in System.setProperty() when HADOOP_HOME
> is not set.
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