{"record":{"id":"42fd075b9ceb69bd","repo":"hyperledger/fabric","slug":"no-cluster-members-to-synchronize-with","errorCode":null,"errorMessage":"no cluster members to synchronize with","messagePattern":"no cluster members to synchronize with","errorType":"error_code","errorClass":null,"httpStatus":null,"severity":"error","filePath":"orderer/consensus/smartbft/synchronizer.go","lineNumber":97,"sourceCode":"\treturn viewMetadata, lastConfigSqn\n}\n\nfunc (s *Synchronizer) synchronize() (*types.Decision, error) {\n\tblockPuller, err := s.BlockPullerFactory.CreateBlockPuller(s.Support, s.ClusterDialer, s.LocalConfigCluster, s.CryptoProvider)\n\tif err != nil {\n\t\treturn nil, errors.Wrap(err, \"cannot get create BlockPuller\")\n\t}\n\tdefer blockPuller.Close()\n\n\theightByEndpoint, _, err := blockPuller.HeightsByEndpoints()\n\tif err != nil {\n\t\treturn nil, errors.Wrap(err, \"cannot get HeightsByEndpoints\")\n\t}\n\n\ts.Logger.Infof(\"HeightsByEndpoints: %v\", heightByEndpoint)\n\n\tif len(heightByEndpoint) == 0 {\n\t\treturn nil, errors.New(\"no cluster members to synchronize with\")\n\t}\n\n\tvar heights []uint64\n\tfor _, value := range heightByEndpoint {\n\t\theights = append(heights, value)\n\t}\n\n\ttargetHeight := s.computeTargetHeight(heights)\n\tstartHeight := s.Support.Height()\n\tif startHeight >= targetHeight {\n\t\treturn nil, errors.Errorf(\"already at height of %d\", targetHeight)\n\t}\n\n\ttargetSeq := targetHeight - 1\n\tseq := startHeight\n\n\tvar blocksFetched int\n","sourceCodeStart":79,"sourceCodeEnd":115,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/orderer/consensus/smartbft/synchronizer.go#L79-L115","documentation":"Raised in Synchronizer.synchronize when HeightsByEndpoints succeeds but returns an empty map — meaning there are zero cluster members to pull blocks from. The synchronizer refuses to proceed because block replication requires at least one reachable remote consenter.","triggerScenarios":"HeightsByEndpoints returned an empty heightByEndpoint map, typically because the channel has no other consenter endpoints configured, or all endpoints were filtered out (e.g. only the node's own endpoint existed, or endpoint resolution discarded unreachable members).","commonSituations":"Single-node channel attempting to sync (nothing to sync with); channel config missing consenter entries; all other orderers removed from channel config; join/bootstrap mistakes leaving an orderer in a channel whose config it cannot see.","solutions":["Ensure the channel configuration contains at least one other reachable consenter endpoint","If this is the only node, synchronization is unnecessary — verify the channel membership in the latest config block","Check earlier logs: if endpoints were probed and failed, fix connectivity so HeightsByEndpoints returns non-empty results","Re-add the missing orderers to the channel via a channel config update"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"// Ensure channel config has other consenters before expecting sync to work\nconsenters := sharedConfig.Consenters()\nif len(consenters) <= 1 {\n    // single-node channel: synchronization with others is impossible by design\n}","typeGuard":null,"tryCatchPattern":"// Sync degrades to local-ledger response; check that fallback explicitly\nresp := synchronizer.Sync()\nif resp.Latest.Height == s.Support.Height()-1 {\n    // local fallback was used; treat as sync failure\n}","preventionTips":["Never run sync-dependent operations on a single-node channel expecting remote replication","Validate channel config contains reachable consenter endpoints before joining","Monitor channel membership changes that remove orderers","Keep at least a quorum of consenters online"],"tags":["consensus","smartbft","fabric","network"],"backgroundTag":"no-cluster-members-available","analyzedSha":"2736b63f8fd5932511d56fe68b7039d15977f7f6","analyzedAt":"2026-09-04T08:52:36.465Z","contentChangedAt":"2026-09-04T08:52:36.465Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}