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https://issues.apache.org/jira/browse/HDFS-14423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16906775#comment-16906775
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Akira Ajisaka commented on HDFS-14423:
--------------------------------------

Would you backport this to branch-2?

> Percent (%) and plus (+) characters no longer work in WebHDFS
> -------------------------------------------------------------
>
>                 Key: HDFS-14423
>                 URL: https://issues.apache.org/jira/browse/HDFS-14423
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: webhdfs
>    Affects Versions: 3.2.0, 3.1.2
>         Environment: Ubuntu 16.04, but I believe this is irrelevant.
>            Reporter: Jing Wang
>            Assignee: Masatake Iwasaki
>            Priority: Major
>             Fix For: 3.3.0, 3.2.1, 3.1.3
>
>         Attachments: HDFS-14423.001.patch, HDFS-14423.002.patch, 
> HDFS-14423.003.patch, HDFS-14423.004.patch
>
>
> The following commands with percent (%) no longer work starting with version 
> 3.1:
> {code:java}
> $ hadoop/bin/hdfs dfs -touchz webhdfs://localhost/%
> $ hadoop/bin/hdfs dfs -cat webhdfs://localhost/%
> cat: URLDecoder: Incomplete trailing escape (%) pattern
> {code}
> Also, plus (+ ) characters get turned into spaces when doing DN operations:
> {code:java}
> $ hadoop/bin/hdfs dfs -touchz webhdfs://localhost/a+b
> $ hadoop/bin/hdfs dfs -mkdir webhdfs://localhost/c+d
> $ hadoop/bin/hdfs dfs -ls /
> Found 4 items
> -rw-r--r--   1 jing supergroup          0 2019-04-12 11:20 /a b
> drwxr-xr-x   - jing supergroup          0 2019-04-12 11:21 /c+d
> {code}
> I can confirm that these commands work correctly on 2.9 and 3.0. Also, the 
> usual hdfs:// client works as expected.
> I suspect a relation with HDFS-13176 or HDFS-13582, but I'm not sure what the 
> right fix is. Note that Hive uses % to escape special characters in partition 
> values, so banning % might not be a good option. For example, Hive will 
> create a paths like {{table_name/partition_key=%2F}} when 
> {{partition_key='/'}}.



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