Are you writing to both sides?
MogileFS _only_ supports sending writes to a *single* database. This is
partially due to how FID locking works, and partially because it's
otherwise completely untested.
I run mogilefs under master-master setups, with the following concessions:
- auto_increment_offset is used to ensure each side gets unique values.
- writes only go to one *active* side.
Either done via an HA VIP or explicit configuration.
You can use the slave configuration and, say, a secondary HA VIP to use
the internal readonly slave support to send some queries to the second
machine.
I've never had to even think about running mogilefs with active
multimaster due to load... It's always been pathetically low.
-Dormando
Clinton Goudie-Nice wrote:
Greetings all,
We've been bulk testing our multimaster setup with a tracker attached to
each master, but we're seeing some odd behavior that I'm hoping I'm just
missing something obvious on.
After a round of bulk testing, the stats for the different trackers is
different. Additionally, after complete (and even after a restart), the
trackers are just going nuts with queries to the database servers.
Stats against node 1:
mogadm --tracker tracker01fs:6001 stats
Statistics for replication...
domain class devcount files
-------------------- ----------- ---------- ----------
testdomain testclass 1 187
testdomain testclass 2 48309
-------------------- ----------- ---------- ----------
Stats against node 2:
mogadm --tracker tracker02fs:6001 stats
Statistics for replication...
domain class devcount files
-------------------- ----------- ---------- ----------
testdomain testclass 1 2
testdomain testclass 2 48494
-------------------- ----------- ---------- ----------
Additionally, I've seen times where I end up with files with a devcount
of 3 even though testclass has a devcount of 2.
Initially, my mogilefsd.conf file looked like this:
db_dsn DBI:mysql:mogilefs:somedbserver
db_user root
db_pass somepass
conf_port 6001
listener_jobs 20
After thinking this through for a bit, It occurred to me that I may need
replication to occur on only one tracker, and deletes to occur on only
one tracker, so...
On the tracker01 node in the mogilefsd.conf I set:
replicate_jobs 5
delete_jobs 0
On the tracker02 node in the mogilefsd.conf I set:
replicate_jobs 0
delete_jobs 5
Then I reran our bulk test, but it ended up out of sync again with the
stats shown above.
Do I need to set some (other) specific settings on each tracker that
says what to do and what not to do on that node, or is something else
going on here?
Thanks!
Clint
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