[Bugs] [Bug 1190734] Enhancement to readdir for tiered volumes
bugzilla at redhat.com
bugzilla at redhat.com
Wed Mar 18 11:47:47 UTC 2015
https://bugzilla.redhat.com/show_bug.cgi?id=1190734
--- Comment #8 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/9688 committed in master by Vijay Bellur
(vbellur at redhat.com)
------
commit a216745e5db3fdb4fa8d625c971e70f8d0e34d23
Author: Dan Lambright <dlambrig at redhat.com>
Date: Wed Feb 18 14:49:50 2015 -0500
cluster/dht: Change the subvolume encoding in d_off to be a "global"
position in the graph rather than relative (local) to a particular
translator.
Encoding the volume in this way allows a single translator to manage
which brick is currently being scanned for directory entries. Using a
single translator minimizes allocated bits in the d_off. It also allows
multiple DHT translators in the same graph to have a common frame of
reference (the graph position) for which brick is being read. Multiple
DHT translators are needed for the Tiering feature.
The fix builds off a previous change (9332) which removed subvolume
encoding from AFR. The fix makes an equivalent change to the EC
translator.
More background can be found in fix 9332 and gluster-dev discussions [1].
DHT and AFR/EC are responsibile (as before) for choosing which brick to
enumerate directory entries in over the readdir lifecycle.
The client translator receiving the readdir fop encodes the dht_t. It
is referred to as the "leaf node" in the graph and corresponds to the
brick being scanned.
When DHT decodes the d_off, it translates the leaf node to a local
subvolume, which represents the next node in the graph leading to
the brick.
Tracking of leaf nodes is done in common utility functions. Leaf nodes
counts and positional information are updated on a graph switch.
[1] www.gluster.org/pipermail/gluster-devel/2015-January/043592.html
Change-Id: Iaf0ea86d7046b1ceadbad69d88707b243077ebc8
BUG: 1190734
Signed-off-by: Dan Lambright <dlambrig at redhat.com>
Reviewed-on: http://review.gluster.org/9688
Reviewed-by: Xavier Hernandez <xhernandez at datalab.es>
Reviewed-by: Krishnan Parthasarathi <kparthas at redhat.com>
Reviewed-by: Vijay Bellur <vbellur at redhat.com>
Tested-by: Vijay Bellur <vbellur at redhat.com>
--
You are receiving this mail because:
You are on the CC list for the bug.
Unsubscribe from this bug https://bugzilla.redhat.com/token.cgi?t=kW4L3QMHnN&a=cc_unsubscribe
More information about the Bugs
mailing list