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From "Kannan Rajah (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-11982) Inconsistency in handling URI without authority
Date Fri, 15 May 2015 22:19:00 GMT
Kannan Rajah created HADOOP-11982:

             Summary: Inconsistency in handling URI without authority
                 Key: HADOOP-11982
                 URL: https://issues.apache.org/jira/browse/HADOOP-11982
             Project: Hadoop Common
          Issue Type: Bug
          Components: fs
    Affects Versions: 2.7.0
            Reporter: Kannan Rajah
            Assignee: Kannan Rajah

There are some inconsistencies coming from Hadoop class Path.java. This seems to be the behavior
for a very long time. I am not sure about the implications of correcting it, so want to get
some opinion.

When you use makeQualified, a NULL authority is converted into empty authority. When authority
is NULL, the toString will not contain the // before the actual absolute path. Otherwise it
will not. There are ecosystem components that may or may not use makeQualified consistently.
We have hit cases where the Path.toString() is used as key in hashmap. So lookups start failing
when the entry has Path object constructed using makeQualified and lookup key does not.

Proposal: Can we default to empty authority always when its NULL?

Path p = new Path("hdfs:/a/b/c")
p.toString() -> hdfs:/a/b/c              -> There is a single slash
p/toString() -> hdfs:///a/b/c            -> There are 3 slashes

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