[jira] [Commented] (HADOOP-9590) Move to JDK7 improved APIs for file operations when available

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-9590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13848414#comment-13848414 ] 

Steve Loughran commented on HADOOP-9590:
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Hadoop does now build & run everywhere, which means that someone needs to start the conversation in hadoop-common-dev "when will trunk mandate java7?". 

> Move to JDK7 improved APIs for file operations when available
> -------------------------------------------------------------
>
>                 Key: HADOOP-9590
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9590
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Ivan Mitic
>
> JDK6 does not have a complete support for local file system file operations. Specifically:
> - There is no symlink/hardlink APIs what forced Hadoop to defer to shell based tooling
> - No error information returned when File#mkdir/mkdirs or File#renameTo fails, making it unnecessary hard to troubleshoot some issues
> - File#canRead/canWrite/canExecute do not perform any access checks on Windows making APIs inconsistent with the Unix behavior
> - File#setReadable/setWritable/setExecutable do not change access rights on Windows making APIs inconsistent with the Unix behavior
> - File#length does not work as expected on symlinks on Windows
> - File#renameTo does not work as expected on symlinks on Windows
> All above resulted in Hadoop community having to fill in the gaps by providing equivalent native implementations or applying workarounds. 
> JDK7 addressed (as far as I know) all (or most) of the above problems, either thru the newly introduced [Files|http://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html] class or thru bug fixes.
> This is a tracking Jira to revisit above mediations once JDK7 becomes the supported platform by the Hadoop community. This work would allow significant portion of the native platform-dependent code to be replaced with Java equivalents what is goodness w.r.t. Hadoop cross-platform support. 



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