G'day!
We're about to start upgrading our Riak clusters from 1.2.1 to 1.3.1 and
I have a couple of questions about the upgrade process.
Firstly, the new "enable_health_checks" config option. It's not clear
what impact this option will have on a busy cluster. The way I read it,
if a riak_kv_vnode message queue goes over the "vnode_mailbox_limit"
DisableThreshold then the riak_kv service is disabled. Doesn't this
effectively take the node down? If you have a busy cluster isn't it
possible that all nodes could hit this limit around the same time and
bring the whole cluster down? Especially if you're running close to the
limit and one node gets taken offline then the other nodes try to take
up the slack which puts them over the threshold. Or am I
misunderstanding this feature?
Is there any way to query the riak_kv_vnode message queue length to get
an idea of how close we are to hitting the limit?
Secondly, reformatting the indexes to fix the 2i integer encoding
problem. Do I need to run the "riak-admin reformat-indexes" on each node
or just once for the whole cluster?
Thanks!
Shane.
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