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https://issues.apache.org/jira/browse/HDFS-14423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16904531#comment-16904531
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Masatake Iwasaki commented on HDFS-14423:
-----------------------------------------
Thanks [~jojochuang]. While the patch looks good, the issued reported as "plus
(+ ) characters get turned into spaces" still seems to be exists. I'm looking
into the cause.
{noformat}
[iwasakims@centos7 hadoop-3.3.0-SNAPSHOT]$ bin/hdfs dfs -touchz
webhdfs://localhost/%
[iwasakims@centos7 hadoop-3.3.0-SNAPSHOT]$ bin/hdfs dfs -touchz
webhdfs://localhost/a+b
[iwasakims@centos7 hadoop-3.3.0-SNAPSHOT]$ bin/hdfs dfs -mkdir
webhdfs://localhost/c+d
[iwasakims@centos7 hadoop-3.3.0-SNAPSHOT]$ bin/hdfs dfs -ls webhdfs://localhost/
[iwasakims@centos7 hadoop-3.3.0-SNAPSHOT]$ bin/hadoop fs -put 'e+f.txt'
'webhdfs://localhost/'
put: rename `webhdfs://localhost/e+f.txt._COPYING_' to
`webhdfs://localhost/e+f.txt': Input/output error
[iwasakims@centos7 hadoop-3.3.0-SNAPSHOT]$ bin/hdfs dfs -ls /
Found 6 items
-rw-r--r-- 1 iwasakims supergroup 0 2019-08-09 23:35 /%
-rw-r--r-- 1 iwasakims supergroup 0 2019-08-09 23:50 /a b
drwxr-xr-x - iwasakims supergroup 0 2019-08-09 23:37 /c+d
-rw-r--r-- 1 iwasakims supergroup 5 2019-08-09 23:52 /e
f.txt._COPYING_
drwxrwxrwx - iwasakims supergroup 0 2019-06-14 13:09 /tmp
drwxr-xr-x - iwasakims supergroup 0 2019-06-14 13:10 /user
{noformat}
> 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: Wei-Chiu Chuang
> Priority: Major
> Attachments: HDFS-14423.001.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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