Hi,
On 30/04/17 06:03, Raghavendra Gowdappa wrote:
All,
Its a common perception that the resolution of a file having linkto file on the
hashed-subvol requires two hops:
1. client to hashed-subvol.
2. client to the subvol where file actually resides.
While it is true that a fresh lookup behaves this way, the other fact that
get's ignored is that fresh lookups on files are almost always prevented by
readdirplus. Since readdirplus picks the dentry from the subvolume where actual
file (data-file) resides, the two hop cost is most likely never witnessed by
the application.
This is true for workloads that list directory contents before accessing
the files, but there are other use cases that directly access the file
without navigating through the file system. In this case fresh lookups
are needed.
Xavi
A word of caution is that I've not done any testing to prove this observation
:).
regards,
Raghavendra
_______________________________________________
Gluster-devel mailing list
Gluster-devel@gluster.org
http://lists.gluster.org/mailman/listinfo/gluster-devel
_______________________________________________
Gluster-devel mailing list
Gluster-devel@gluster.org
http://lists.gluster.org/mailman/listinfo/gluster-devel
