On Mon, 27 Feb 2012, Andrew Deason wrote:
On Fri, 24 Feb 2012 02:51:48 -0800
Ken Elkabany <[email protected]> wrote:
Off-email question: If a volume has N read replicas, how do clients
choose which one to use?
By default, it's effectively random. Technically the client also takes
into account the ip addresses of the client and server to try and
estimate how "close" it is to each fileserver, but it does so using
antiquated classful addressing techniques and usually isn't very useful.
Er, I would have thought that this would cause a group of clients deployed
near each other to all prefer the same replica, which is not really
"random". That is, though from the point of view of a single client the
choice may be random, from the point of view of managing server load it is
not. Is that incorrect?
-Ben
You can view the preferences the client is using by running
'fs getserverprefs'. You can set your own preferences to override the
default semi-random ones with 'fs setserverprefs'. Servers with lower
numbers are preferred over the others.
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