Without quorum, the client has no idea how current the read data may
be. It might be from a replica that is hours/days/weeks out of data.
Sometimes this won't matter, sometimes it will be a critical failing.
-dB
On 5/9/2018 6:40 PM, Prasanth Mathialagan wrote:
For reads, is Quorum necessary? Reads are served from local the local
replica, right?
On Wed, May 9, 2018 at 8:29 AM, Jordan Zimmerman <jor...@jordanzimmerman.com
wrote:
A quorum means (n/2)+1 - In a 3 node cluster that is 2. So, if 2 servers
are up you can achieve quorum.
we need odd
numbers in order to form a quorum
The "odd" in this formula refers to the number of configured servers not
how many are running at a given time. That's the reasoning for quorum in
the first place. Quorum I/O ensures that a majority of nodes is referenced
for reads or writes (in ZooKeeper writes are what matter for quorum).
-Jordan
On May 9, 2018, at 10:26 AM, Kaushal Shriyan <kaushalshri...@gmail.com>
wrote:
Hi,
In a ensemble of 3 nodes with 1 leader and 2 followers, if the leader
goes
down then two servers can elect a leader among themselves. But we need
odd
numbers in order to form a quorum. I am confused. Please correct me if i
am
understanding it wrong.
Any help will be highly appreciable
Best Regards,
Kaushal
