On Wed, 25 Mar 2015, Deneau, Tom wrote:
A couple of client-monitor questions:
1) When a client contacts a monitor to get the cluster map, how does it
decide which monitor to try to contact?
It picks a random monitor what the information it's seeded with at startup
(via ceph.conf or the -m command line option). Once it reaches one mon,
it gets the MonMap which tells it who all of the mons are.
2) Having gotten the cluster map, assuming a client wants to do multiple
reads and writes,
does the client have to re-contact the monitor to get the latest cluster
map
for each operation?
No, the mons are primarily needed for the initial startup/authentication
step. They are also queried as a last resort if the client thinks it
has an out of data osdmap and hasn't gotten one from an OSD, and to
renew authentication tickets.
sage
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