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https://issues.apache.org/jira/browse/HADOOP-4014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628606#action_12628606
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Steve Loughran commented on HADOOP-4014:
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The quoted OS in in a JVM comes from the JRE; different JVMs detect different
values, and tend to lag OS releases. OpenJDK even reports different things from
a closed JDK. Which makes it very hard to do OS family detection reliably. Its
probalby only java6+ that detects Vista, for example.
The most broadly tested code for this in apache is Ant's OS condition
http://svn.apache.org/viewvc/ant/core/trunk/src/main/org/apache/tools/ant/taskdefs/condition/Os.java?view=markup
This
-lowercases in the US locale the jvm properties
-assumes the presence of "windows" in the OS => windows, assumes further than
only a few limited versions are win9x; the rest is NT-based
-looks for various strings for macos
-guesses that systems with / and : as seperators are unix-like
-looks for various obscure operating systems
-or bails out
I'd recommend taking this code and adapting it; strip out netware and OS/360
support if need be. This routine is the first one to get bugreps when a new OS
or JDK ships, so is maintained.
> DFS upgrade fails on Windows
> ----------------------------
>
> Key: HADOOP-4014
> URL: https://issues.apache.org/jira/browse/HADOOP-4014
> Project: Hadoop Core
> Issue Type: Bug
> Components: fs
> Affects Versions: 0.18.0
> Environment: Windows XP, Windows 2003 Server
> Reporter: NOMURA Yoshihide
> Attachments: HADOOP-4014.patch
>
>
> FileUtil.HardLink#createHardLink() didn't work on Windows, and DFS upgrade of
> Datanode fails.
> The windows command 'fsutil' requires the arguments link name first as
> follows,
> > fsutil hardlink create <link name> <target>
> But the current FileUtil passes the target first.
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