thanks Jonathan. I see a advantage in doing it one AZ or rack at a time. On Thu, Oct 8, 2015 at 6:41 PM, Jonathan Haddad <j...@jonhaddad.com> wrote:
> My hunch is the bigger your cluster the less impact it will have, as each > node takes part in smaller and smaller % of total queries. Considering > that compaction is always happening, I'd wager if you've got a big cluster > (as you say you do) you'll probably be ok running several cleanups at a > time. > > I'd say start one, see how your perf is impacted (if at all) and go from > there. > > If you're running a proper snitch you could probably do an entire rack / > AZ at a time. > > > On Thu, Oct 8, 2015 at 3:08 PM sai krishnam raju potturi < > pskraj...@gmail.com> wrote: > >> We plan to do it during non-peak hours when customer traffic is less. >> That sums up to 10 nodes a day, which is concerning as we have other data >> centers to be expanded eventually. >> >> Since cleanup is similar to compaction, which is CPU intensive and will >> effect reads if this data center were to serve traffic. Is running cleanup >> in parallel advisable?? >> >> On Thu, Oct 8, 2015, 17:53 Jonathan Haddad <j...@jonhaddad.com> wrote: >> >>> Unless you're close to running out of disk space, what's the harm in it >>> taking a while? How big is your DC? At 45 min per node, you can do 32 >>> nodes a day. Diverting traffic away from a DC just to run cleanup feels >>> like overkill to me. >>> >>> >>> >>> On Thu, Oct 8, 2015 at 2:39 PM sai krishnam raju potturi < >>> pskraj...@gmail.com> wrote: >>> >>>> hi; >>>> our cassandra cluster currently uses DSE 4.6. The underlying >>>> cassandra version is 2.0.14. >>>> >>>> We are planning on adding multiple nodes to one of our datacenters. >>>> This requires "nodetool cleanup". The "nodetool cleanup" operation >>>> takes around 45 mins for each node. >>>> >>>> Datastax documentation recommends running "nodetool cleanup" for one >>>> node at a time. That would be really long, owing to the size of our >>>> datacenter. >>>> >>>> If we were to divert the read and write traffic away from a particular >>>> datacenter, could we run "cleanup" on multiple nodes in parallel for >>>> that datacenter?? >>>> >>>> >>>> http://docs.datastax.com/en/cassandra/2.0/cassandra/operations/ops_add_node_to_cluster_t.html >>>> >>>> >>>> thanks >>>> Sai >>>> >>>
