Ivan Mitic created HADOOP-9590:
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Summary: 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:
- JDK6 does not provide symlink/hardlink APIs what forced Hadoop to defer to
shell based tooling
- JDK6 does not return any useful error information when File#mkdir/mkdirs or
File#renameTo fails making it unnecessary hard to troubleshoot some issues
- JDK6 File#canRead/canWrite/canExecute do not perform any access checks on
Windows making APIs inconsistent with the Unix behavior
- JDK6 File#setReadable/setWritable/setExecutable do not change access rights
on Windows making APIs inconsistent with the Unix behavior
- JDK6 File#length does not work as expected on symlinks on Windows
- JDK6 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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