{"record":{"id":"ca440f4d41291243","repo":"hashicorp/nomad","slug":"no-plugin-for-that-allocation","errorCode":null,"errorMessage":"no plugin for that allocation","messagePattern":"no plugin for that allocation","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"client/dynamicplugins/registry.go","lineNumber":429,"sourceCode":"func (d *dynamicRegistry) PluginForAlloc(ptype, name, allocID string) (*PluginInfo, error) {\n\td.pluginsLock.Lock()\n\tdefer d.pluginsLock.Unlock()\n\n\tpmap, ok := d.plugins[ptype]\n\tif !ok {\n\t\treturn nil, fmt.Errorf(\"no plugins registered for type: %s\", ptype)\n\t}\n\n\tinfos, ok := pmap[name]\n\tif ok {\n\t\tfor e := infos.Front(); e != nil; e = e.Next() {\n\t\t\tplugin := e.Value.(*PluginInfo)\n\t\t\tif plugin.AllocID == allocID {\n\t\t\t\treturn plugin, nil\n\t\t\t}\n\t\t}\n\t}\n\treturn nil, fmt.Errorf(\"no plugin for that allocation\")\n}\n\n// PluginsUpdatedCh returns a channel over which plugin events for the requested\n// plugin type will be emitted. These events are strongly ordered and will never\n// be dropped.\n//\n// The receiving channel _must not_ be closed before the provided context is\n// cancelled.\nfunc (d *dynamicRegistry) PluginsUpdatedCh(ctx context.Context, ptype string) <-chan *PluginUpdateEvent {\n\tb := d.broadcasterForPluginType(ptype)\n\tch := b.subscribe()\n\tgo func() {\n\t\tselect {\n\t\tcase <-b.shutdownCh:\n\t\t\treturn\n\t\tcase <-ctx.Done():\n\t\t\tb.unsubscribe(ch)\n\t\t}","sourceCodeStart":411,"sourceCodeEnd":447,"githubUrl":"https://github.com/hashicorp/nomad/blob/482b49bf1aec006f089bcfc7e632d8f6ac303e5e/client/dynamicplugins/registry.go#L411-L447","documentation":"PluginForAlloc found plugins registered under the type and name, but none of the registered instances has the requested AllocID. The registry keeps a list per plugin name (multiple allocations can host the same plugin name over time); the caller's allocID did not match any list entry. Distinguishes \"plugin exists\" from \"this specific allocation's instance is gone\".","triggerScenarios":"Calling PluginForAlloc with an allocID that was never registered or has since been deregistered - e.g. the plugin allocation was restarted/rescheduled and a new allocID replaced the old one; passing a stale allocID captured earlier.","commonSituations":"A CSI plugin allocation rescheduled to another node or restarted with a new allocation ID while a volume/task still references the old ID; client GC removed the plugin registration; using an allocID from a stale plan or task state.","solutions":["Re-fetch the current allocation ID from the allocation/task state instead of a cached one.","Confirm the plugin allocation is still running on this client (nomad alloc status <id>).","If the alloc was rescheduled, look up the plugin by the new allocation ID or re-run the operation against the new instance.","Add retry logic that re-reads the registry on this error since registration is dynamic."],"exampleFix":"// before\ninfo, err := registry.PluginForAlloc(\"csi-plugin\", \"aws-ebs\", oldAllocID) // alloc rescheduled\n// after\nallocID := task.GetAlloc().ID // current allocation\ninfo, err := registry.PluginForAlloc(\"csi-plugin\", \"aws-ebs\", allocID)","handlingStrategy":"validation","validationCode":"// always derive allocID from live state, never cache it across reschedules\nallocID := taskEnv.AllocID // current allocation ID from the task environment/hook\nif allocID == \"\" { return fmt.Errorf(\"cannot look up plugin: no allocation ID available\") }","typeGuard":null,"tryCatchPattern":"info, err := registry.PluginForAlloc(ptype, name, allocID)\nif err != nil && strings.Contains(err.Error(), \"no plugin for that allocation\") {\n    // stale allocID: re-read current state and retry once\n    return fmt.Errorf(\"plugin %s/%s no longer served by alloc %s (rescheduled?): %w\", name, ptype, allocID, err)\n}","preventionTips":["Never persist allocIDs across allocation updates; re-read from task/allocation state each time.","Handle plugin alloc restarts/reschedules by re-resolving the plugin instance on failure.","Check the alloc's desired status before lookup to short-circuit obviously stale IDs."],"tags":["plugin-registry","nomad","go","stale-reference"],"backgroundTag":"plugin-alloc-not-found","analyzedSha":"482b49bf1aec006f089bcfc7e632d8f6ac303e5e","analyzedAt":"2026-09-04T07:54:14.808Z","contentChangedAt":"2026-09-04T07:54:14.808Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}