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https://issues.apache.org/jira/browse/HDFS-14323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16842345#comment-16842345
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Srinivasu Majeti commented on HDFS-14323:
-----------------------------------------
Thank you very much [~jojochuang] for your time to review and approval.
> Distcp fails in Hadoop 3.x when 2.x source webhdfs url has special characters
> in hdfs file path
> -----------------------------------------------------------------------------------------------
>
> Key: HDFS-14323
> URL: https://issues.apache.org/jira/browse/HDFS-14323
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: webhdfs
> Affects Versions: 3.2.0
> Reporter: Srinivasu Majeti
> Assignee: Srinivasu Majeti
> Priority: Major
> Fix For: 3.3.0, 3.2.1, 3.1.3
>
> Attachments: HDFS-14323v0.patch
>
>
> There was an enhancement to allow semicolon in source/target URLs for distcp
> use case as part of HDFS-13176 and backward compatibility fix as part of
> HDFS-13582 . Still there seems to be an issue when trying to trigger distcp
> from 3.x cluster to pull webhdfs data from 2.x hadoop cluster. We might need
> to deal with existing fix as described below by making sure if url is already
> encoded or not. That fixes it.
> diff --git
> a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
>
> b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
> index 5936603c34a..dc790286aff 100644
> ---
> a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
> +++
> b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
> @@ -609,7 +609,10 @@ URL toUrl(final HttpOpParam.Op op, final Path fspath,
> boolean pathAlreadyEncoded = false;
> try {
> fspathUriDecoded = URLDecoder.decode(fspathUri.getPath(), "UTF-8");
> - pathAlreadyEncoded = true;
> + if(!fspathUri.getPath().equals(fspathUriDecoded))
> + {
> + pathAlreadyEncoded = true;
> + }
> } catch (IllegalArgumentException ex) {
> LOG.trace("Cannot decode URL encoded file", ex);
> }
>
>
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