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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-15691) Add PathCapabilities to FS and FC to complement StreamCapabilities
Date Fri, 21 Sep 2018 14:22:01 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15691?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HADOOP-15691:
------------------------------------
    Status: Patch Available  (was: Open)

> Add PathCapabilities to FS and FC to complement StreamCapabilities
> ------------------------------------------------------------------
>
>                 Key: HADOOP-15691
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15691
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>         Attachments: HADOOP-15691-001.patch, HADOOP-15691-002.patch, HADOOP-15691-003.patch
>
>
> Add a {{PathCapabilities}} interface to both FileSystem and FileContext to declare the
capabilities under the path of an FS
> This is needed for 
> * HADOOP-15407: declare that a dest FS supports permissions
> * object stores to declare that they offer PUT-in-place alongside (slow-rename)
> * Anything else where the implementation semantics of an FS is so different caller apps
would benefit from probing for the underlying semantics
> I know, we want all filesystem to work *exactly* the same. But it doesn't hold, especially
for object stores —and to efficiently use them, callers need to be able to ask for specific
features.



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