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Chris LuandDevin
9281ed8007
* master: never auto-admit raft peers on a single-node configuration A master started without cluster peers (peers=none, or no peers so the list holds only itself) declares a one-node cluster, yet any foreign master that registered over KeepConnected was admitted as a second voter. The resulting two-voter cluster cannot reach quorum when the foreign peer is unreachable, wedging a previously healthy single master. Gate raft admission on having been configured with cluster peers; masters started with a peer list keep the announce-to-join flow used to grow the cluster. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * master: source SingleMaster from -peers=none, not the peer count A master started with an empty peer list ends up with a one-peer map containing itself, and NewMasterServer inferred declared single-master mode from that count. The master still mints a raft cluster through the bootstrap path, but AdmitRaftPeer then ignores every later joiner, so a deployment that grows from one master to several can never form a quorum. isSingleMasterMode already spells out the declared case (-peers=none); populate MasterOption.SingleMaster from it instead. * master: cover clustered raft admission with a real in-memory leader The previous clustered test had no raft leader and asserted nothing, so an AdmitRaftPeer that always returned early still passed. Bootstrap a single-node hashicorp raft over the in-memory transport, wait for leadership, and assert the leader reports and admits a missing peer. * master: return the raft admission result and assert committed join AdmitRaftPeer ran AddVoter on a detached goroutine, so the only observable state was an in-flight marker deleted on success and failure alike, and the clustered test could never tell whether the join worked. Admission now hands back a result channel; the test runs a connected second in-memory node and asserts the peer sees itself a committed voter. --------- Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>