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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13055) Implement linkMergeSlash for ViewFs
Date Mon, 03 Oct 2016 23:38:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15543769#comment-15543769
] 

Zhe Zhang commented on HADOOP-13055:
------------------------------------

Sorry for getting back to this late.

[~shv] Yes the patch only implements {{linkMergeSlash}} instead of {{linkMerge}} in general.

[~manojg] Thanks for the interest! Yes it would be great if you can take over this task. Unassigning
myself now. I'll get back to your question after refreshing my own memory on the patch.

> 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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