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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13840) Implement getUsed() for ViewFileSystem
Date Thu, 01 Dec 2016 00:15:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15710304#comment-15710304
] 

Andrew Wang commented on HADOOP-13840:
--------------------------------------

LGTM +1 besides the flagged javadoc errors. Thanks for working on this Manoj!

> Implement getUsed() for ViewFileSystem
> --------------------------------------
>
>                 Key: HADOOP-13840
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13840
>             Project: Hadoop Common
>          Issue Type: Task
>          Components: viewfs
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Manoj Govindassamy
>            Assignee: Manoj Govindassamy
>         Attachments: HADOOP-13840.01.patch, HADOOP-13840.02.patch
>
>
> ViewFileSystem doesn't override {{FileSystem#getUSed()}}. So, when file system used space
is queried for slash root "/" paths, the default implementations tries to run the {{getContentSummary}}
which crashes on seeing unexpected mount points under slash. 
> ViewFileSystem#getUsed() is not expected to collate all the space used from all the mount
points configured under "/". Proposal is to avoid invoking FileSystem#getUsed() and throw
NotInMountPointException until LinkMergeSlash is supported.



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