Aren't you asking for dynamic ZK configuration which isn't supported yet (ZOOKEEPER-107, only in in 3.5.0-alpha)? How do you swap a zookeeper instance from being an observer to a voting member?
On 30 October 2015 at 09:34, Matteo Grolla <matteo.gro...@gmail.com> wrote: > Pushkar... I love this solution > thanks > I'd just go with 3 zk nodes on each side > > 2015-10-29 23:46 GMT+01:00 Pushkar Raste <pushkar.ra...@gmail.com>: > > > How about having let's say 4 nodes on each side and make one node in one > of > > data centers a observer. When data center with majority of the nodes go > > down, bounce the observer by reconfiguring it as a voting member. > > > > You will have to revert back the observer back to being one. > > > > There will be a short outage as far as indexing is concerned but queries > > should continue to work and you don't have to take all the zookeeper > nodes > > down. > > > > -- Pushkar Raste > > On Oct 29, 2015 4:33 PM, "Matteo Grolla" <matteo.gro...@gmail.com> > wrote: > > > > > Hi Walter, > > > it's not a problem to take down zk for a short (1h) time and > > > reconfigure it. Meanwhile solr would go in readonly mode. > > > I'd like feedback on the fastest way to do this. Would it work to just > > > reconfigure the cluster with other 2 empty zk nodes? Would they > correctly > > > sync from the nonempty one? Should first copy data from zk3 to the two > > > empty zk? > > > Matteo > > > > > > > > > 2015-10-29 18:34 GMT+01:00 Walter Underwood <wun...@wunderwood.org>: > > > > > > > You can't. Zookeeper needs a majority. One node is not a majority of > a > > > > three node ensemble. > > > > > > > > There is no way to split a Solr Cloud cluster across two datacenters > > and > > > > have high availability. You can do that with three datacenters. > > > > > > > > You can probably bring up a new Zookeeper ensemble and configure the > > Solr > > > > cluster to talk to it. > > > > > > > > wunder > > > > Walter Underwood > > > > wun...@wunderwood.org > > > > http://observer.wunderwood.org/ (my blog) > > > > > > > > > > > > > On Oct 29, 2015, at 10:08 AM, Matteo Grolla < > matteo.gro...@gmail.com > > > > > > > wrote: > > > > > > > > > > I'm designing a solr cloud installation where nodes from a single > > > cluster > > > > > are distributed on 2 datacenters which are close and very well > > > connected. > > > > > let's say that zk nodes zk1, zk2 are on DC1 and zk2 is on DC2 and > > let's > > > > say > > > > > that DC1 goes down and the cluster is left with zk3. > > > > > how can I restore a zk quorum from this situation? > > > > > > > > > > thanks > > > > > > > > > > > > > >
