On Jan 31, 2005, at 10:01 AM, Michael Bartosh wrote:
On Jan 31, 2005, at 6:56 AM, Matt Richard wrote:
There is also a problem with the way OD clients pick the replica they
want to use. From my experience it seems like the clients grab the
information from cn=ldapreplicas,cn=config,dc=example,dc=edu which
has a list of all the valid OD servers. After that the client starts
using the first server in the list, which is the OD master. If the
OD master is unavailable, the clients will switch to another replica.
The client sequentially queries these servers, miliseconds apart,
using the first responder. Happenstance means that unless there's
latency between you and the Master, you'll more often than not use the
master.
Note- Apple promotes Open Directory replication as a load balancing
architecture. I find this disingenuous at best. There is no
back-channel load balancing architecture.. and dependencies on Kerberos
(and I like Kerberos, don't get me wrong make any other load balancing
difficult. I don't feel like Apple has yet learned to under-promise and
over deliver.
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Michael Bartosh
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"The surest way to corrupt a youth is to instruct him to hold in higher
regard those who think alike than those who think differently."
