Make contracts of LocalFileSystem and DistributedFileSystem consistent
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Key: HADOOP-4114
URL: https://issues.apache.org/jira/browse/HADOOP-4114
Project: Hadoop Core
Issue Type: Improvement
Components: dfs, fs
Reporter: Tom White
There are a number of edge cases that the two file system implementations
handle differently. In particular:
* When trying to make a directory under an existing file, HDFS throws an
IOException while LocalFileSystem doesn't.
* The FileSytem#listStatus(Path) method returns null for a non-existent file on
HDFS, while LocalFileSytem returns an empty FileStatus array.
* When trying to rename a non-existent path, LocalFileSystem throws an
IOException, while HDFS returns false.
* When renaming a file or directory to a non-existent directory (e.g. /a/b to
/c/d, where /c doesn't exist) LocalFileSystem succeeds (returns true) while
HDFS fails (false).
* When renaming a file (or directory) as an existing file (or directory)
LocalFileSystem succeeds (returns true) while HDFS fails (false).
We should document the expected behaviour for these cases in FileSystem's
javadoc, and make sure all implementations conform to it.
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