On 8/22/2018 11:10 AM, ilango dhandapani wrote:
So, if I have 3 zk servers on 1st DC, 2 solr servers on 1st DC and 2 solr
servers on 2nd DC, this will work right ? Other than network/latency between
DC1 and DC2 for solr replication.
No. This is what I was trying to tell you.
With half your ZK servers in one DC and half in the other, if you lose
either datacenter, ZK loses quorum, and SolrCloud switches to
read-only. If you still have a complete copy of your indexes, you'll be
able to continue making queries, but you will be unable to make any
changes to any index until the datacenter comes back up. When there are
six ZK servers, you must have at least four of them operational and
reachable, or you do not have quorum.
For fault tolerance on ZK, you need at least three data centers. So
that if you lose any datacenter, quorum can still be maintained with the
ZK servers in the other two datacenters.
Thanks,
Shawn
