Colin Patrick McCabe created HADOOP-9972:
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Summary: new APIs for listStatus and globStatus to deal with
symlinks
Key: HADOOP-9972
URL: https://issues.apache.org/jira/browse/HADOOP-9972
Project: Hadoop Common
Issue Type: Improvement
Reporter: Colin Patrick McCabe
Assignee: Colin Patrick McCabe
Based on the discussion in HADOOP-9912, we need new APIs for FileSystem to deal
with symlinks. The issue is that code has been written which is incompatible
with the existence of things which are not files or directories. For example,
there is a lot of code out there that looks at FileStatus#isFile, and
if it returns false, assumes that what it is looking at is a
directory. In the case of a symlink, this assumption is incorrect.
It seems reasonable to make the default behavior of {{FileSystem#listStatus}}
and {{FileSystem#globStatus}} be fully resolving symlinks, and ignoring
dangling ones. This will prevent incompatibility with existing MR jobs and
other HDFS users. We should also add new versions of listStatus and globStatus
that allow new, symlink-aware code to deal with symlinks as symlinks.
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