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https://issues.apache.org/jira/browse/HADOOP-8087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13711472#comment-13711472
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Colin Patrick McCabe commented on HADOOP-8087:
----------------------------------------------
I did some tests and this bug is still present:
{code}
cmccabe@keter:~> /h/bin/hadoop fs -ls /alpha/beta
Found 1 items
drwxr-xr-x - cmccabe supergroup 0 2013-07-17 11:51 /alpha/beta/gamma
cmccabe@keter:~> /h/bin/hadoop fs -ls /alpha/////beta
Found 1 items
drwxr-xr-x - cmccabe supergroup 0 2013-07-17 11:51 /alpha/beta/gamma
cmccabe@keter:~> /h/bin/hadoop fs -ls //alpha/beta
ls: No FileSystem for scheme: null
{code}
For consistency's sake, I think we should interpret {{//alpha/beta}} as the
path {{/alpha/beta}} in the default scheme.
It's also worth pointing out that in shell scripts, it's a lot simpler to just
do this:
{code}
./bin/hadoop fs -touchz /${FOO}/${BAR}/${BAZ}
{code}
without having to special-case the scenario where FOO is empty. If you have do
something different when FOO is empty (like omit a slash) the script gets
complex. This is the real win behind handling multiple slashes as a path
separator, as we currently do.
> Paths that start with a double slash cause "No filesystem for scheme: null"
> errors
> ----------------------------------------------------------------------------------
>
> Key: HADOOP-8087
> URL: https://issues.apache.org/jira/browse/HADOOP-8087
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.23.0, 0.24.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
>
> {{Path}} is incorrectly parsing {{//dir/path}} in a very unexpected way.
> While it should translate to the directory {{$fs.default.name}/dir/path}}, it
> instead discards the {{//dir}} and returns
> {{$fs.default.name/path}}. The problem is {{Path}} is trying to parsing an
> authority even when a scheme is not present.
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