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From "Manoj Govindassamy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13055) Implement linkMergeSlash for ViewFileSystem
Date Fri, 03 Mar 2017 00:59:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15893509#comment-15893509
] 

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

[~andrew.wang],

HADOOP-14136 has requested for DefaultFS to fallback whenever the mounts are not resolvable.
Kind of Hierarchical Mount FS support for ViewFS but only at the root level. This does bring
in whole new set of cases to consider for all other supported FS operations on ViewFS, but
I am going to investigate on what it takes to get fallback DefaultFS for ViewFS. Would your
concern on this jira HADOOP-13055 and the patch be addressed if we can club this in with the
fix for HADOOP-14136 ? Please share your thoughts. 

> Implement linkMergeSlash for ViewFileSystem
> -------------------------------------------
>
>                 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: Manoj Govindassamy
>         Attachments: HADOOP-13055.00.patch, HADOOP-13055.01.patch, HADOOP-13055.02.patch,
HADOOP-13055.03.patch, HADOOP-13055.04.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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