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https://issues.apache.org/jira/browse/HADOOP-8842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470083#comment-13470083
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Suresh Srinivas commented on HADOOP-8842:
-----------------------------------------
branch 20.x, since some of the applications could be dependent on the behavior
they might be getting from their implementation of the file system, we decided
not to break the compatibility by retaining the old behavior.
> local file system behavior of mv into an empty directory is inconsistent with
> HDFS
> ----------------------------------------------------------------------------------
>
> Key: HADOOP-8842
> URL: https://issues.apache.org/jira/browse/HADOOP-8842
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.20.2
> Reporter: Julien Le Dem
>
> moving into an empty directory replaces the directory instead.
> See output of attached script to reproduce :
> repro.sh
> {noformat}
> rm -rf local_fs_bug
> mkdir local_fs_bug
> hdfs -rmr local_fs_bug
> hdfs -mkdir local_fs_bug
> echo ">>> HDFS: normal behavior"
> touch part-0000
> hdfs -mkdir local_fs_bug/a
> hdfs -copyFromLocal part-0000 local_fs_bug/a
> hdfs -mkdir local_fs_bug/b
> hdfs -mkdir local_fs_bug/b/c
> echo "content of a: 1 part"
> hdfs -ls local_fs_bug/a
> echo "content of b/c: empty"
> hdfs -ls local_fs_bug/b/c
> echo "mv a b/c"
> hdfs -mv local_fs_bug/a local_fs_bug/b/c
> echo "resulting content of b/c"
> hdfs -ls local_fs_bug/b/c
> echo "a is moved inside of c"
> echo
> echo ">>> local fs: bug"
> mkdir -p local_fs_bug/a
> touch local_fs_bug/a/part-0000
> mkdir -p local_fs_bug/b/c
> echo "content of a: 1 part"
> hdfs -fs local -ls local_fs_bug/a
> echo "content of b/c: empty"
> hdfs -fs local -ls local_fs_bug/b/c
> echo "mv a b/c"
> hdfs -fs local -mv local_fs_bug/a local_fs_bug/b/c
> echo "resulting content of b/c"
> hdfs -fs local -ls local_fs_bug/b/c
> echo "bug: a replaces c"
> echo
> echo ">>> but it works if the destination is not empty"
> mkdir local_fs_bug/a2
> touch local_fs_bug/a2/part-0000
> mkdir -p local_fs_bug/b2/c2
> touch local_fs_bug/b2/c2/dummy
> echo "content of a2: 1 part"
> hdfs -fs local -ls local_fs_bug/a2
> echo "content of b2/c2: 1 dummy file"
> hdfs -fs local -ls local_fs_bug/b2/c2
> echo "mv a2 b2/c2"
> hdfs -fs local -mv local_fs_bug/a2 local_fs_bug/b2/c2
> echo "resulting content of b/c"
> hdfs -fs local -ls local_fs_bug/b2/c2
> echo "a2 is moved inside of c2"
> {noformat}
> Output:
> {noformat}
> >>> HDFS: normal behavior
> content of a: 1 part
> Found 1 items
> -rw-r--r-- 3 julien g 0 2012-09-25 17:16
> /user/julien/local_fs_bug/a/part-0000
> content of b/c: empty
> mv a b/c
> resulting content of b/c
> Found 1 items
> drwxr-xr-x - julien g 0 2012-09-25 17:16
> /user/julien/local_fs_bug/b/c/a
> a is moved inside of c
> >>> local fs: bug
> content of a: 1 part
> 12/09/25 17:16:34 WARN fs.FileSystem: "local" is a deprecated filesystem
> name. Use "file:///" instead.
> Found 1 items
> -rw-r--r-- 1 julien g 0 2012-09-25 17:16
> /home/julien/local_fs_bug/a/part-0000
> content of b/c: empty
> 12/09/25 17:16:34 WARN fs.FileSystem: "local" is a deprecated filesystem
> name. Use "file:///" instead.
> mv a b/c
> 12/09/25 17:16:35 WARN fs.FileSystem: "local" is a deprecated filesystem
> name. Use "file:///" instead.
> resulting content of b/c
> 12/09/25 17:16:35 WARN fs.FileSystem: "local" is a deprecated filesystem
> name. Use "file:///" instead.
> Found 1 items
> -rw-r--r-- 1 julien g 0 2012-09-25 17:16
> /home/julien/local_fs_bug/b/c/part-0000
> bug: a replaces c
> >>> but it works if the destination is not empty
> content of a2: 1 part
> 12/09/25 17:16:36 WARN fs.FileSystem: "local" is a deprecated filesystem
> name. Use "file:///" instead.
> Found 1 items
> -rw-r--r-- 1 julien g 0 2012-09-25 17:16
> /home/julien/local_fs_bug/a2/part-0000
> content of b2/c2: 1 dummy file
> 12/09/25 17:16:37 WARN fs.FileSystem: "local" is a deprecated filesystem
> name. Use "file:///" instead.
> Found 1 items
> -rw-r--r-- 1 julien g 0 2012-09-25 17:16
> /home/julien/local_fs_bug/b2/c2/dummy
> mv a2 b2/c2
> 12/09/25 17:16:37 WARN fs.FileSystem: "local" is a deprecated filesystem
> name. Use "file:///" instead.
> resulting content of b/c
> 12/09/25 17:16:38 WARN fs.FileSystem: "local" is a deprecated filesystem
> name. Use "file:///" instead.
> Found 2 items
> drwxr-xr-x - julien g 4096 2012-09-25 17:16
> /home/julien/local_fs_bug/b2/c2/a2
> -rw-r--r-- 1 julien g 0 2012-09-25 17:16
> /home/julien/local_fs_bug/b2/c2/dummy
> a2 is moved inside of c2
> {noformat}
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