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https://issues.apache.org/jira/browse/HADOOP-9061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13510085#comment-13510085
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Ivan Mitic commented on HADOOP-9061:
bq. One way to handle this would be to disable symlinks on Windows unless JDK7
is present. Another way would be a symlink-aware implementation of operations
like File#renameTo on JDK6 and earlier. This would have to be JNI, I think, and
could be done in libhadoop.so.
Thanks Colin for the comment! We started with a similar approach initially (by
exposing a JNI for symlink target length extraction), however, even with this,
we still have problems in case apps directly use File to access the symlink.
I believe the attached patch somewhat aligns with what you had in mind. Let me
know what you think.
Java6+Windows does not work well with symlinks
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Key: HADOOP-9061
URL: https://issues.apache.org/jira/browse/HADOOP-9061
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 1-win
Reporter: Ivan Mitic
Assignee: Ivan Mitic
Attachments: HADOOP-9061.branch-1-win.symlinks.patch
We’ve seen multiple problems with file operations on symbolic links on Java6
on Windows. Specifically:
- File#length returns zero on symbolic links
- File#renameTo renames the target, not the symlink
Problematic scenarios are mainly related to symlinks created for dist cache.
Java7 does not have above problems.
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