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Posted to common-issues@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2016/09/02 02:07:20 UTC
[jira] [Commented] (HADOOP-13055) Implement linkMergeSlash for
ViewFs
[ https://issues.apache.org/jira/browse/HADOOP-13055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15457244#comment-15457244 ]
Konstantin Shvachko commented on HADOOP-13055:
----------------------------------------------
Started looking at the patch. So do you implement just the "linkMergeSlash" case? And the merge mount in general will remain unimplemented.
> 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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