https://jira.opendaylight.org This file is an XML representation of an issue en-us 8.20.10 820010 22-06-2022 https://jira.opendaylight.org/browse/CONTROLLER-1589 controller <p>Scenario were trying to do:</p> <p>We want to have a shard started with replicas on all cluster members(even ones added at any time in the future).</p> <p>Currently the raft implementation seems to quite fragile when dynamically adding peers, when you send an AddServer message to the actor on MemberUp/Reachable events the followers seem to always ignore it leading to each peer having different set of peers which leads to never ending elections.<br/> The current implementation seems to rely either on having hardcoded replicas in the module conf. If we went similar route like the ClusterAdminService addReplica does this also seems to only update peers on the leader which leads to the neverending elections due to different peers for each actor.</p> <p>Operating System: All<br/> Platform: All</p> CONTROLLER-1589

Current raft implementation seems to be unstable when dynamically adding peers when new nodes come up.

Bug Resolved Cannot Reproduce Unassigned Tomas Cere Fri, 27 Jan 2017 16:11:15 +0000 Tue, 25 Jul 2023 08:24:20 +0000 Thu, 13 Apr 2017 12:42:09 +0000 clustering 0 3 <p>Based on the discussion on Clustering Hackers' call, the configuration update should work as follows:</p> <ul class="alternate" type="square"> <li>ShardManager creates the local replica</li> <li>ShardManager sends AddServer to the leader</li> <li>The leader will catch up the new follower via a ApplySnapshot</li> <li>It then updates its configuration and replicates to all followers</li> </ul> <p>So sending AddServer to followers should not be necessary.</p> <p>Is there an actual issue here or can we close this?</p> <p>Hi Tom,</p> <p>I have tried approach mentioned above and I have been able to add new shards. However, I have seen some problems with creating shards in some scenarios, possibly, because of bugs in our shard starting logic.</p> <p>I will try to fix them and will see if this is an actual issue. If not I will close the bug.</p> Blocks CONTROLLER-1588 Development External issue ID 7696 External issue URL Issue Type Rank 0|i02ri7: