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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-15691) Add PathCapabilities to FS and FC to complement StreamCapabilities
Date Thu, 23 Aug 2018 17:50:00 GMT
Steve Loughran created HADOOP-15691:
---------------------------------------

             Summary: 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


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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