[Cluster-devel] cman init rework

[David Teigland]

On Thu, Mar 26, 2009 at 02:50:31PM +0100, Fabio M. Di Nitto wrote:
> In our current startup sequence, we do start a daemon, we make sure it
> starts, but we never check if it's actually working properly.

If there's no groupd_compat setting in cluster.conf, or if it's set to 2, then
groupd does compat "detection" when it starts up, looking for old cluster2
nodes that require compat mode.  This detection phase can sometimes take a
while.  Other daemons have to ask groupd about the mode it chose after the
detection phase, and retry for a while if it's still pending.  It might be
nice for the init script to wait for this detection phase to complete after
starting groupd.  To do this we can run 'group_tool compat' and loop until
"pending" doesn't show up in a grep.  We should probably loop for somewhere
around 10 seconds, there's no good predictable number.  If groupd is still
pending after that time, the init script should just continue since it's most
likely taking longer than expected.  Other daemons are already prepared to
wait for groupd to pick a mode during their startup.