{"record":{"id":"ac0453e7e360f1d1","repo":"hyperledger/fabric","slug":"cannot-find-ledger-for-channel-s","errorCode":null,"errorMessage":"cannot find ledger for channel %s","messagePattern":"cannot find ledger for channel (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"core/ledger/snapshotgrpc/snapshot_service.go","lineNumber":141,"sourceCode":"\t\t\tIdentity:  signatureHdr.Creator,\n\t\t\tData:      signedRequest.Request,\n\t\t\tSignature: signedRequest.Signature,\n\t\t}},\n\t); err != nil {\n\t\treturn err\n\t}\n\n\treturn nil\n}\n\nfunc (s *SnapshotService) getLedger(channelID string) (ledger.PeerLedger, error) {\n\tif channelID == \"\" {\n\t\treturn nil, errors.New(\"missing channel ID\")\n\t}\n\n\tlgr := s.LedgerGetter.GetLedger(channelID)\n\tif lgr == nil {\n\t\treturn nil, errors.Errorf(\"cannot find ledger for channel %s\", channelID)\n\t}\n\n\treturn lgr, nil\n}\n","sourceCodeStart":123,"sourceCodeEnd":146,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/core/ledger/snapshotgrpc/snapshot_service.go#L123-L146","documentation":"This error is returned by snapshot_service.go's getLedger when the LedgerGetter has no ledger registered for the requested channel ID. The snapshot gRPC service (Generate, Cancel, QueryPendings) resolves the channel to a live ledger before doing any snapshot work; a nil result means the peer does not have that channel's ledger instantiated. It is a request-targeting error: the channel name is syntactically fine but unknown to this peer.","triggerScenarios":"Calling the snapshot service RPCs Generate, Cancel, or QueryPendings with a channelID that the local peer has not joined (no ledger exists for it). Also triggered when the ledger has not yet been initialized for a joined channel, or when the channel was created on other peers but never joined locally.","commonSituations":"Typo in the channel name in a snapshot script; invoking snapshot operations against a peer that never joined the channel; a peer restarted with a fresh data directory before the channel ledger was rebuilt; race where the snapshot RPC arrives during peer startup before ledgers are opened.","solutions":["Verify the peer has joined the channel: run 'peer channel list' and confirm the channelID matches exactly.","If the peer has not joined, fetch the channel config block and run 'peer channel join' with it.","Check for typos/case mismatches in the channelID passed to Generate, Cancel, or QueryPendings.","If the peer was recently restarted, wait for ledger initialization to complete and retry; check peer logs for ledger open errors."],"exampleFix":"// before: calling snapshot generate on an unjoined channel\nGenerate(ctx, &snapshot.Request{Channel: \"mychannel1\"})\n// after: verify channel membership first\nchannels, _ := adminClient.GetChannels(ctx)\nif !contains(channels.Channels, \"mychannel\") {\n    return fmt.Errorf(\"join mychannel before requesting snapshots\")\n}\nGenerate(ctx, &snapshot.Request{Channel: \"mychannel\"})","handlingStrategy":"validation","validationCode":"if channelID == \"\" {\n    return fmt.Errorf(\"refusing snapshot call: empty channel ID\")\n}\njoined, err := adminClient.GetChannels(ctx) // peer channel list equivalent\nif err != nil { return err }\nfor _, ch := range joined.Channels {\n    if ch.Name == channelID { return nil }\n}\nreturn fmt.Errorf(\"peer has not joined channel %q\", channelID)","typeGuard":null,"tryCatchPattern":"resp, err := svc.Generate(ctx, req)\nif err != nil {\n    if strings.Contains(err.Error(), \"cannot find ledger for channel\") {\n        // channel not joined on this peer: reconcile membership or fix channelID\n        return fmt.Errorf(\"channel %s not joined on peer: %w\", req.Channel, err)\n    }\n    return err\n}","preventionTips":["Always verify 'peer channel list' includes the target channel before snapshot operations.","Keep channel IDs in a shared config/constant instead of ad-hoc strings to avoid typos.","Add readiness checks that wait for ledgers to open before issuing snapshot RPCs after peer restart."],"tags":["fabric","ledger","channel","grpc","snapshot"],"backgroundTag":"unknown-channel-ledger","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"}