I understand that memcached servers do not communicate with each
other. I also understand that consistent hashing algorithm in client
libraries endure that data is distributed evenly between the servers.
What I am not clear about is:
Scenario 1:
Three server nodes running. key1 is stores on server #1. Server #1
goes down.
1-) Client makes a request on key1 stored on failed server. My
assumption is that cache will get a miss and value for key1 will be
retrieved from DB and stored in server #2.
2-) Now dead server is brought up. Client makes the request on a
key1 again. Does client get the key1 from server #2 then store it back
into server #1? How does re balancing occur?
Scenario 2:
Three nodes running. Another node is added. How does memcached
redistribute values to new node? I know that servers themselves do not
communicate with each other.
I hope my examples were clear. Your help will be appreciated.
