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https://issues.apache.org/jira/browse/HADOOP-9590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13665740#comment-13665740
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Ivan Mitic commented on HADOOP-9590:
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Thanks Steve for responding. You’re proposal "build and run on Java7
everywhere" first makes sense to me. The intent of this Jira was solely to
start documenting the benefits from switching to JDK7 w.r.t. local file system
operations (so that we don't forget). I was not planning on working on this
Jira anytime soon.
Bq. Maybe we should create two meta-JIRA's "build and run on Java7 everywhere"
and only after that "adopt java-7 specific features".
+1. First step for "build and run on Java7 everywhere" would be to resolve
things like HADOOP-9350 and get all unittests to pass. Not sure where we are
w.r.t. pass rates on JDK7 (I know the random test case execution order
introduced a lot of churn).
Thanks Chris for adding on to the list!
> 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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