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From "Manoj Govindassamy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13055) Implement linkMergeSlash for ViewFs
Date Mon, 03 Oct 2016 21:44:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15543519#comment-15543519
] 

Manoj Govindassamy commented on HADOOP-13055:
---------------------------------------------

Hi [~zhz],

After the support for "fs.viewfs.mounttable.linkMergeSlash", should an explicit slash mount
"fs.viewfs.mounttable.link./" be treated like linkMergeSlash ? I don't see the patch handling
this case -- like supporting or gracefully denying it. Can you please clarify ?  I would be
happy to work on this if you are currently onto something else. Please let me know.

> Implement linkMergeSlash for ViewFs
> -----------------------------------
>
>                 Key: HADOOP-13055
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13055
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs, viewfs
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>         Attachments: HADOOP-13055.00.patch, HADOOP-13055.01.patch, HADOOP-13055.02.patch
>
>
> In a multi-cluster environment it is sometimes useful to operate on the root / slash
directory of an HDFS cluster. E.g., list all top level directories. Quoting the comment in
{{ViewFs}}:
> {code}
>  *   A special case of the merge mount is where mount table's root is merged
>  *   with the root (slash) of another file system:
>  *   <ul>
>  *   <li>    fs.viewfs.mounttable.default.linkMergeSlash=hdfs://nn99/
>  *   </ul>
>  *   In this cases the root of the mount table is merged with the root of
>  *            <b>hdfs://nn99/ </b> 
> {code}



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