multi-master installation steps. about keydb

[benschermel]

Please take a look at the documentation site: https://docs.keydb.dev/docs/multi-master where there is an example. If you just have 2 nodes you may want to try out active-rep option.

Cheers,

Ben

[shivakumarss]

Thanks a lot Ben, I will use the documentation, some how i didnt find it earlier.

I had started with active-active deployment but my use-case seems to not fit in there, let me tell you what i am trying to solve and what is my expectations.

• right now i am having a isolated redis setup in each of the zones ( EU, Asia, SG ) .
• Each of them are maintaining some counters which are zone specific.
• Now the requirement is these counters should not be zone specific it should be shared across.
• I am looking for a solution, lets a key "a" can be incr across zones and they in sync.

I have already evaluated active-active where it doesn't seems to solve my problem, here is what i did.

servera - define a variable and set it to 1 and incr to 3
serverb - verify its value is 3.
-- disconnect the server by giving the wrong port and restart ----
servera - incr the variable till it reaches 6
serverb - incr the variable till it reaches 6
-- sync -- 
servera - value is 6
serverb - value is 6

here my expectation was to have a value of 9 but since the framework uses last write strategy, the variable was synced with value which was written by its latest timestamp.

Is there any way i can change the sync strategy ?

Here i am assuming multi-master would solve the problem, because as per documentation it would not drop the database while the sync with master and it would merge read/writes.

Edit : Based on the merge strategies available and the use case, i think CRDT based resolution will solve the issue. please let me know how do i achieve it or direct me to the documentation for the same.

Thanks a lot.
Shiva

[JohnSully]

Is there any way i can change the sync strategy ?

Hi @shivakumarss

I intentionally only started with the most simple synchronization strategy. CRDTs are a planned feature but its quite complex to implement and will take some time.

[shivakumarss]

Hi @JohnSully Thanks for letting us know.
I have created another ticket for feature request for CRDT sync strategy #47 for us to know once it is done and i am closing this ticket.

Thanks a lot.
Shiva