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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15217) org.apache.hadoop.fs.FsUrlConnection does not handle paths with spaces
Date Fri, 01 Jun 2018 20:23:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16498520#comment-16498520
] 

Xiao Chen commented on HADOOP-15217:
------------------------------------

Thanks [~josephfourny] for reporting the issue with great details and providing a test case.
Thanks Zsolt/Gabor for working on this and review.

LGTM overall, a few comments:
 - I think we can just pass in the URI from {{url.toUri()}} to construct the Path object
 - In the test, no need to catch the exception and fail. We can rely on the IOE failing the
unit test by itself, which will have enough message to debug.
 - Preexisting in {{TestUrlStreamHandlerFactory}}, but let's add a test timeout here. Can
add a Rule on the class to handle all test cases.

> org.apache.hadoop.fs.FsUrlConnection does not handle paths with spaces
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-15217
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15217
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 3.0.0
>            Reporter: Joseph Fourny
>            Assignee: Zsolt Venczel
>            Priority: Major
>         Attachments: HADOOP-15217.01.patch, TestCase.java
>
>
> When _FsUrlStreamHandlerFactory_ is registered with _java.net.URL_ (ex: when Spark is
initialized), it breaks URLs with spaces (even though they are properly URI-encoded). I traced
the problem down to _FSUrlConnection.connect()_ method. It naively gets the path from the
URL, which contains encoded spaces, and pases it to _org.apache.hadoop.fs.Path(String)_ constructor.
This is not correct, because the docs clearly say that the string must NOT be encoded. Doing
so causes double encoding within the Path class (ie: %20 becomes %2520). 
> See attached JUnit test. 
> This test case mimics an issue I ran into when trying to use Commons Configuration 1.9
AFTER initializing Spark. Commons Configuration uses URL class to load configuration files,
but Spark installs _FsUrlStreamHandlerFactory_, which hits this issue. For now, we are using
an AspectJ aspect to "patch" the bytecode at load time to work-around the issue. 
> The real fix is quite simple. All you need to do is replace this line in _org.apache.hadoop.fs.FsUrlConnection.connect()_:
>         is = fs.open(new Path(url.getPath()));
> with this line:
>      is = fs.open(new Path(url.*toUri()*.getPath()));
> URI.getPath() will correctly decode the path, which is what is expected by _org.apache.hadoop.fs.Path(String)_ constructor.
>  



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