Comments (2)
In the Raft dissertation, §4.2.2 describes removing the current leader. The suggestion is to utilize the leadership transfer extension. We carry with the membership operation and the leader steps down after it is committed. This is necessary to make progress, it could be difficult to step down and then remove the node, as it would require an election to happen first.
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Going through the leader transfer mechanism in §3.10, I do not find it interesting to include. Quoting: "we have not currently implemented or evaluated this leadership transfer approach.". However, we can utilize some of the ideas.
A node can only be a leader if it has an up-to-date log. Since the membership operation also goes through consensus. After it is committed, we are sure we have nodes with up-to-date logs. We could start an election round on the current leader and utilize only the current member list to restrict.
The tricky part is handling the pending requests, where we might have pending requests during the membership operations. The simplest solution would be to complete everything exceptionally. The complex solution would be to make the current leader enqueue requests and redirect everything after a new leader is elected.
The latter would require changes mostly to the REDIRECT
protocol. We could return a specific error code to retry.
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Related Issues (20)
- Add membership operations to RaftHandle
- Provide quorum reads for `ReplicatedStateMachine`
- `Client` and `ClientStub` issues during membership operations
- Liveness issue with ELECTION HOT 3
- can't remove leader by method of RaftHandle's removeServer HOT 9
- this.raftHandle.channel().disconnect() and reconnect trigger error "not found in retransmission table" HOT 7
- Questions HOT 2
- Ensure a single leader per term
- Configurable class loader for ReplicatedStateMachine block
- CounterTest.testIgnoreReturnValue test failure HOT 5
- Remove ant and use only maven HOT 2
- Restarting node after membership change
- Fix longest log check during election
- Liveness issue joining during election thread execution
- Concurrency issue leads to nodes voting twice in same term
- Election problem HOT 2
- The election process may elect a leader who has left the group HOT 7
- Leader left before the coordinator apply the election result HOT 5
- Multiple LevelDB instances in same process will cause a .sst file being locked HOT 5
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