[sr-dev] git:master: db_cluster: new module for generic database clustering

[Juha Heinanen]

daniel,

i gave db_cluster module a try.  i configured serial connections and it
worked fine:  when i stopped mysql server behind the higher priority
connection, queries started to work over the lower priority connection.

there is one thing that bothers me.  when higher priority connection is
not available, i get these kind of error to syslog even when queries
succeed over the lower priority connection:

Mar 29 20:24:52 sip /usr/sbin/sip-proxy[18966]: ERROR: db_mysql [km_dbase.c:122]: driver error on query: Can't connect to MySQL server on '192.98.102.13' (115)
Mar 29 20:24:52 sip /usr/sbin/sip-proxy[18966]: ERROR: <core> [db_query.c:156]: error while submitting query

it would be nice if those error messages could somehow be suppressed
when one of the connections is still operational and the queries
actually succeed.  someone may namely run such incomplete cluster many
hours and during that time syslog will be filled with those (confusing)
error messages.

-- juha