{"record":{"id":"87bbf5d71228d1fc","repo":"vitessio/vitess","slug":"error-setting-tablet-to-read-write-w","errorCode":null,"errorMessage":"Error setting tablet to read-write: %w","messagePattern":"Error setting tablet to read-write: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"go/vt/vtadmin/api.go","lineNumber":2396,"sourceCode":"\treturn &vtadminpb.SetReadOnlyResponse{}, nil\n}\n\n// SetReadWrite is part of the vtadminpb.VTAdminServer interface.\nfunc (api *API) SetReadWrite(ctx context.Context, req *vtadminpb.SetReadWriteRequest) (*vtadminpb.SetReadWriteResponse, error) {\n\tspan, ctx := trace.NewSpan(ctx, \"API.SetReadWrite\")\n\tdefer span.Finish()\n\n\ttablet, c, err := api.getTabletForAction(ctx, span, rbac.ManageTabletWritabilityAction, req.Alias, req.ClusterIds)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\n\terr = c.SetWritable(ctx, &vtctldatapb.SetWritableRequest{\n\t\tTabletAlias: tablet.Tablet.Alias,\n\t\tWritable:    true,\n\t})\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"Error setting tablet to read-write: %w\", err)\n\t}\n\n\treturn &vtadminpb.SetReadWriteResponse{}, nil\n}\n\n// StartReplication is part of the vtadminpb.VTAdminServer interface.\nfunc (api *API) StartReplication(ctx context.Context, req *vtadminpb.StartReplicationRequest) (*vtadminpb.StartReplicationResponse, error) {\n\tspan, ctx := trace.NewSpan(ctx, \"API.StartReplication\")\n\tdefer span.Finish()\n\n\ttablet, c, err := api.getTabletForAction(ctx, span, rbac.ManageTabletReplicationAction, req.Alias, req.ClusterIds)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\n\tstart := true\n\tif err := c.ToggleTabletReplication(ctx, tablet, start); err != nil {\n\t\treturn nil, err","sourceCodeStart":2378,"sourceCodeEnd":2414,"githubUrl":"https://github.com/vitessio/vitess/blob/01a25a7d176f94613b8d59d799f438380a8760e4/go/vt/vtadmin/api.go#L2378-L2414","documentation":"SetReadWrite calls vtctld SetWritable(writable=true) on the tablet; failure of that RPC is wrapped with this message. The tablet stays read-only and the wrapped vtctld error is returned to the caller.","triggerScenarios":"Calling API.SetReadWrite when the cluster's SetWritable RPC fails (vtctld unreachable, tablet down, RPC error).","commonSituations":"Trying to re-enable writes during a failback while the tablet is still in a bad state; vtctld outage; stale tablet alias after tablet rebuild.","solutions":["Verify the tablet is healthy and reachable, then retry SetReadWrite","Check vtadmin-to-vtctld connectivity and the inner wrapped error details","Confirm the tablet alias is current (topo lookup) before retrying"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"// confirm tablet status before restoring writes\n// e.g. ensure replication is caught up and tablet serves the expected type","typeGuard":null,"tryCatchPattern":"resp, err := client.SetReadWrite(ctx, req)\nif err != nil {\n    if strings.Contains(err.Error(), \"Error setting tablet to read-write\") {\n        return fmt.Errorf(\"tablet %s not set read-write: %w — verify tablet and vtctld health\", alias, err)\n    }\n    return err\n}","preventionTips":["Verify replication health before flipping a tablet back to writable","Retry transient vtctld RPC failures with backoff","Keep tablet aliases sourced from a fresh topo lookup, not cached values"],"tags":["vtadmin","tablet","vtctld","rpc"],"backgroundTag":"vtctld-rpc-failed","analyzedSha":"01a25a7d176f94613b8d59d799f438380a8760e4","analyzedAt":"2026-09-01T17:28:30.605Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}