{"record":{"id":"2a0bdf348cb07213","repo":"hashicorp/nomad","slug":"error-tailing-file-v","errorCode":null,"errorMessage":"Error tailing file: %v","messagePattern":"Error tailing file: (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"command/alloc_fs.go","lineNumber":335,"sourceCode":"\t\t\toffset = file.Size\n\t\t}\n\n\t\tif follow {\n\t\t\tr, readErr = f.followFile(client, alloc, path, api.OriginEnd, offset, numLines)\n\t\t} else {\n\t\t\t// This offset needs to be relative from the front versus the follow\n\t\t\t// is relative to the end\n\t\t\toffset = file.Size - offset\n\t\t\tr, readErr = client.AllocFS().ReadAt(alloc, path, offset, -1, nil)\n\n\t\t\t// If numLines is set, wrap the reader\n\t\t\tif numLines != -1 {\n\t\t\t\tr = NewLineLimitReader(r, int(numLines), int(numLines*bytesToLines), 1*time.Second)\n\t\t\t}\n\t\t}\n\n\t\tif readErr != nil {\n\t\t\treadErr = fmt.Errorf(\"Error tailing file: %v\", readErr)\n\t\t}\n\t}\n\n\tif r != nil {\n\t\tdefer r.Close()\n\t}\n\tif readErr != nil {\n\t\tf.Ui.Error(readErr.Error())\n\t\treturn 1\n\t}\n\n\t_, err = io.Copy(os.Stdout, r)\n\tif err != nil {\n\t\tf.Ui.Error(fmt.Sprintf(\"error tailing file: %s\", err))\n\t\treturn 1\n\t}\n\n\treturn 0","sourceCodeStart":317,"sourceCodeEnd":353,"githubUrl":"https://github.com/hashicorp/nomad/blob/482b49bf1aec006f089bcfc7e632d8f6ac303e5e/command/alloc_fs.go#L317-L353","documentation":"nomad alloc fs CLI error from the tail (-tail) path: AllocFS().ReadAt or followFile from OriginEnd failed while streaming the requested slice of the allocation file; the underlying API error is wrapped and printed.","triggerScenarios":"Thrown at command/alloc_fs.go:335 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Confirm the file exists and the requested offset is within the file size","Check allocation/client connectivity and that the task is still running","Reduce -n/-c values or retry if the file rotated during the read"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"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"}