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https://issues.apache.org/jira/browse/HDFS-16977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17714104#comment-17714104
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ASF GitHub Bot commented on HDFS-16977:
---------------------------------------
YuanbenWang commented on PR #5547:
URL: https://github.com/apache/hadoop/pull/5547#issuecomment-1514732281
> > Some pathnames which contains special character(s) may lead to
unexpected results. For example, there is a file named "/foo/file*" in my
cluster, created by "DistributedFileSystem.create(new Path("/foo/file*"))".
When I want to remove it, I type in "hadoop fs -rm /foo/file*" in shell.
However, I remove all the files with the prefix of "/foo/file*" unexpectedly.
There are also some other characters just like '*', such as ' ', '|', '&', etc.
>
> Should have escaped the special character. That is how shell behaves.
>
> ```
> bash-4.2$ hdfs dfs -ls /dir
> Found 6 items
> drwxr-xr-x - hadoop supergroup 0 2023-04-17 12:41 /dir/a
> drwxr-xr-x - hadoop supergroup 0 2023-04-17 12:41 /dir/ab*
> drwxr-xr-x - hadoop supergroup 0 2023-04-17 12:42 /dir/abc
> drwxr-xr-x - hadoop supergroup 0 2023-04-17 12:42 /dir/abcd
> drwxr-xr-x - hadoop supergroup 0 2023-04-17 12:42 /dir/abcde
> drwxr-xr-x - hadoop supergroup 0 2023-04-17 12:42 /dir/abcdef
> bash-4.2$ hdfs dfs -rm -r /dir/ab\\*
> Deleted /dir/ab*
> bash-4.2$ hdfs dfs -ls /dir
> Found 5 items
> drwxr-xr-x - hadoop supergroup 0 2023-04-17 12:41 /dir/a
> drwxr-xr-x - hadoop supergroup 0 2023-04-17 12:42 /dir/abc
> drwxr-xr-x - hadoop supergroup 0 2023-04-17 12:42 /dir/abcd
> drwxr-xr-x - hadoop supergroup 0 2023-04-17 12:42 /dir/abcde
> drwxr-xr-x - hadoop supergroup 0 2023-04-17 12:42 /dir/abcdef
> ```
Thank you for your reviewing and it‘s a useful way to escape special
character.
Actually, this PR aims to offer an optional and simple way to avoid the risk
of misoperation.
> Forbid assigned characters in pathname.
> ---------------------------------------
>
> Key: HDFS-16977
> URL: https://issues.apache.org/jira/browse/HDFS-16977
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: dfsclient, namenode
> Affects Versions: 3.3.4
> Reporter: WangYuanben
> Priority: Minor
> Labels: pull-request-available
>
> Some pathnames which contains special character(s) may lead to unexpected
> results. For example, there is a file named "/foo/file*" in my cluster,
> created by "DistributedFileSystem.create(new Path("/foo/file*"))". When I
> want to remove it, I type in "hadoop fs -rm /foo/file*" in shell. However, I
> remove all the files with the prefix of "/foo/file*" unexpectedly. There are
> also some other characters just like '*', such as ' ', '|', '&', etc.
>
> Therefore, it's necessary to restrict the occurrence of these characters in
> pathname. A simple but effective way is to forbid assigned characters in
> pathname when new file or directory is created.
>
> It is also important to add the same function on the Router model and WebHdfs
> model. I will add them as two subtasks later.
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