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-Feature
--------
-
-readdir-ahead
-
-Summary
--------
-
-Provide read-ahead support for directories to improve sequential
-directory read performance.
-
-Owners
-------
-
-Brian Foster
-
-Current status
---------------
-
-Gluster currently does not attempt to improve directory read
-performance. As a result, simple operations (i.e., ls) on large
-directories are slow.
-
-Detailed Description
---------------------
-
-The read-ahead feature for directories is analogous to read-ahead for
-files. The objective is to detect sequential directory read operations
-and establish a pipeline for directory content. When a readdir request
-is received and fulfilled, preemptively issue subsequent readdir
-requests to the server in anticipation of those requests from the user.
-If sequential readdir requests are received, the directory content is
-already immediately available in the client. If subsequent requests are
-not sequential or not received, said data is simply dropped and the
-optimization is bypassed.
-
-Benefit to GlusterFS
---------------------
-
-Improved read performance of large directories.
-
-### Scope
-
-Nature of proposed change
--------------------------
-
-readdir-ahead support is enabled through a new client-side translator.
-
-Implications on manageability
------------------------------
-
-None beyond the ability to enable and disable the translator.
-
-Implications on presentation layer
-----------------------------------
-
-N/A
-
-Implications on persistence layer
----------------------------------
-
-N/A
-
-Implications on 'GlusterFS' backend
------------------------------------
-
-N/A
-
-Modification to GlusterFS metadata
-----------------------------------
-
-N/A
-
-Implications on 'glusterd'
---------------------------
-
-N/A
-
-How To Test
------------
-
-Performance testing. Verify that sequential reads of large directories
-complete faster (i.e., ls, xfs\_io -c readdir).
-
-User Experience
----------------
-
-Improved performance on sequential read workloads. The translator should
-otherwise be invisible and not detract performance or disrupt behavior
-in any way.
-
-Dependencies
-------------
-
-N/A
-
-Documentation
--------------
-
-Set the associated config option to enable or disable directory
-read-ahead on a volume:
-
-		gluster volume set <vol> readdir-ahead [enable|disable]
-
-readdir-ahead is disabled by default.
-
-Status
-------
-
-Development complete for the initial version. Minor changes and bug
-fixes likely.
-
-Future versions might expand to provide generic caching and more
-flexible behavior.
-
-Comments and Discussion
------------------------
-\ No newline at end of file