On 12/09/2011 11:53 AM, John Loehrer wrote:
I am currently evaluating riak. I'd like to be able to do periodic
snapshots of /var/lib/riak using LVM without stopping the node.
According to a response on this ML you should be able to copy the
data directory for eleveldb backend.
http://comments.gmane.org/gmane.comp.db.riak.user/5202
If I cycle through each node and do `riak stop` before taking a
snapshot everything works fine. But if I don't shut down the node
before copying, I run into problems. Since I access the http
interface of the cluster through an haproxy load-balancer, once the
node turns off it is taken out of the pool almost immediately. But
for a millisecond or two before haproxy detects the node is down
there might be some bad responses. I can live with it and build
better retries into my client, but would rather avoid it if I can.
Haproxy has a standby system you can use to remove a node from rotation
politely, allowing existing requests to finish. You can remove them from
haproxy directly at the command line (or using http-check
disable-on-404, but that doesn't really make sense for riak)
echo "disable server <backend>/<node>" | socat stdio
/etc/haproxy/haproxysock
... perform maintenance ...
echo "enable server <backend>/<node>" | socat stdio /etc/haproxy/haproxysock
--Kyle
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