Howdy,
I would like some guidance about designing a zookeeper architecture to support
the following multi site scenario.
Based on what I read about the way elections work, I’m concerned the below
won’t be possible.
Scenario:
1. I have a need to run some applications, which use zookeeper for state (Kafka
for Example). And run it as a single system, across multiple sites.
2. Environment consists of 3 sets of servers, Call them Rack A, B & C. Each
set consists of a rack of equipment with multiple (20+) machines in it.
3. Each Set/Rack is located in a different part of the building complex,
but ALL are connected by high speed network. (1gb/s or better).
4. In NORMAL operation, ALL 3 Rack’s will be up and running,
5. In a failure OR maintenance scenario, it can reduce to 2 racks running,
(1 shutdown), OR only 1 Rack running (2 racks shutdown).
Racks are shut down relatively regularly for maintenance and patching,
(at least every couple of months) or for Disaster testing.
I can’t change the network configuration, and have limited control over when
they shutdown various racks for maintenance.
Note 1: This is not an abstract problem, the setup exists, and there is a
similar same setup, but only 2 Racks (A & B), in at least 2 other sites.
Note 2: There are not other ‘sites/racks’ in which to put some kind of
election broker node. I only have these 3 locations to choose from.
Question is: Is it possible to run Zookeerer in this environment, supporting
ONE rack running (hard), and also both ‘everything running’ (easy), ‘2 Racks
running’ (easy)
All Assistance gratefully appreciated
If anyone has run a similar setup and would like to discuss further, I’d be
more than happy to
Regards
Mark.
