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https://issues.apache.org/jira/browse/HDFS-14323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16782256#comment-16782256
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Srinivasu Majeti commented on HDFS-14323:
-----------------------------------------
Hi [~jojochuang],
Its with HDP 3.1 [ having HDFS 3.1.1 ] . hdfs dfs ls works and distcp with
hdfs://hostname:8020 also works fine . Its only the url encoding on 3.1 side
and failing with decoding at 2.6 side as it does have decoding feature. We have
given the fix yesterday to WalMart and its working fine with the patch attached
here :) .
> 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
> Priority: Major
> 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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