Hi Swapnil, Thanks for trying Ratis!
Are they starting with the same RaftGroup? All servers A, B and C should have the same RaftGroup(A, B, C) when they start up. Tsz-Wo On Wed, Aug 3, 2022 at 1:32 PM Swapnil Tailor <[email protected]> wrote: > Hello, > > We are trying to use ratis library to our existing Presto Distributed > query engine. We are facing one issue while working on updating the peers > in the cluster: > > Ratis Server runs on multiple resource managers, and it takes time for > them to get up and join the cluster. So we require the Ratis server to have > atleast 2 server before it starts the server. This works well. But the > issue happens in the leader selection as mentioned below: > 1. There are 3 ratis servers in the cluster, A, B, C > 2. With server A seeing serve B, the minimum server count matches and it > starts the server with peers list as A, B > 3. Now when server C starts, we try to update the peer list using client > api: > RaftClient.admin().setContfiguration(updated peer list), but for > some reason this is not working correctly and there are multiple leaders > getting elected in the cluster. > > Can someone help understand how should we fix that? And also if the peer > updation logic is correct by each server running RaftClient and update the > configuration as and when it sees the peer list has changes (i.e. a new > server joins the cluster/existing one dies/replaced). > > Also side question: Can someone invite me to the slack channel to be part > of the community? > > Thanks in advance, > Swapnil >
