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https://issues.apache.org/jira/browse/HADOOP-8616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450224#comment-13450224
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Sandy Ryza commented on HADOOP-8616:
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The problem occurs when the ViewFileSystem attempts to create a
ChRootedFileSystem as its target file system. It calls getPath() on the URI
object passed to it, which, for a URI like "hdfs://ha-nn-uri", returns an empty
string. Where does it make the most sense to handle this? Where the
ViewFileSystem reads the config (in the InodeTree constructor)? Where the
ViewFileSystem creates the URI (inside the createLink() method in InodeTree)?
In the ChRootedFileSystem constructor?
> ViewFS configuration requires a trailing slash
> ----------------------------------------------
>
> Key: HADOOP-8616
> URL: https://issues.apache.org/jira/browse/HADOOP-8616
> Project: Hadoop Common
> Issue Type: Bug
> Components: viewfs
> Affects Versions: 0.23.0, 2.0.0-alpha
> Reporter: Eli Collins
>
> If the viewfs config doesn't have a trailing slash commands like the
> following fail:
> {noformat}
> bash-3.2$ hadoop fs -ls
> -ls: Can not create a Path from an empty string
> Usage: hadoop fs [generic options] -ls [-d] [-h] [-R] [<path> ...]
> {noformat}
> We hit this problem with the following configuration because
> "hdfs://ha-nn-uri" does not have a trailing "/".
> {noformat}
> <property>
> <name>fs.viewfs.mounttable.foo.link./nameservices/ha-nn-uri</name>
> <value>hdfs://ha-nn-uri</value>
> </property>
> {noformat}
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