[Bugs] [Bug 1414217] New: RFE: Add a server side stub to filter unhashed directories in readdirp

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1414217

            Bug ID: 1414217
           Summary: RFE: Add a server side stub to filter unhashed
                    directories in readdirp
           Product: GlusterFS
           Version: mainline
         Component: distribute
          Assignee: bugs at gluster.org
          Reporter: pgurusid at redhat.com
                CC: bugs at gluster.org



Description of problem:
Currently there are two variations of readdirp:
1. Directories are read from all the bricks and the client filters the
duplicate directory entries, by removing the entry if it doesn't hash to the
brick that returned the readdirp.
2. dht-readdir-optimise option on: In this case, the directory is read from
only one brick(first up subvol) and dht indicates all other bricks to filter
the directory entries(at the posix layer)

1- is less performant, while 2 has the problem that some directories can go
unlisted if they are not healed to the first up subvol. Hence to get the
performance of option 2 and reliability of option 1: we can have a dht stub on
the server side which filters the directories in readdirp if they do not hash
to that brick. This was proposed by Rghavendra Gowdappa

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