{"record":{"id":"b40c8721f8021467","repo":"hyperledger/fabric","slug":"error-while-reading-from-the-snapshot-file-s","errorCode":null,"errorMessage":"error while reading from the snapshot file: %s","messagePattern":"error while reading from the snapshot file: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"common/ledger/snapshot/file.go","lineNumber":145,"sourceCode":"// like the FileCreator, would take a `hasher` as an input\ntype FileReader struct {\n\tfile              *os.File\n\tbufReader         *bufio.Reader\n\treusableByteSlice []byte\n}\n\n// OpenFile constructs a FileReader. This function returns an error if the format of the file, stored in the\n// first byte, does not match with the expectedDataFormat\nfunc OpenFile(filePath string, expectDataformat byte) (*FileReader, error) {\n\tfile, err := os.Open(filePath)\n\tif err != nil {\n\t\treturn nil, errors.Wrapf(err, \"error while opening the snapshot file: %s\", filePath)\n\t}\n\tbufReader := bufio.NewReader(file)\n\tdataFormat, err := bufReader.ReadByte()\n\tif err != nil {\n\t\tfile.Close()\n\t\treturn nil, errors.Wrapf(err, \"error while reading from the snapshot file: %s\", filePath)\n\t}\n\tif dataFormat != expectDataformat {\n\t\tfile.Close()\n\t\treturn nil, errors.New(fmt.Sprintf(\"unexpected data format: %x\", dataFormat))\n\t}\n\treturn &FileReader{\n\t\tfile:      file,\n\t\tbufReader: bufReader,\n\t}, nil\n}\n\n// DecodeString reads and decodes a string\nfunc (r *FileReader) DecodeString() (string, error) {\n\tb, err := r.decodeBytes()\n\treturn string(b), err\n}\n\n// DecodeBytes reads and decodes bytes","sourceCodeStart":127,"sourceCodeEnd":163,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/common/ledger/snapshot/file.go#L127-L163","documentation":"After opening, OpenFile reads the first byte of the snapshot file, which encodes the data format version. This error wraps a failure reading that byte, meaning the file exists but its contents could not be read (empty file or read error). On failure it closes the file before returning.","triggerScenarios":"bufReader.ReadByte() fails: the snapshot file is zero bytes long, or a read I/O error occurs on the first byte.","commonSituations":"Truncated snapshot created by an earlier failed export, empty placeholder file at the configured path, storage I/O error while reading.","solutions":["Check the snapshot file is non-empty (ls -l / stat)","Regenerate the snapshot via a fresh export if truncated","Investigate the wrapped OS read error for hardware/storage issues"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"st, err := os.Stat(path)\nif err == nil && st.Size() < 1 { return errors.New(\"snapshot file is truncated/empty\") }","typeGuard":null,"tryCatchPattern":"fr, err := snapshot.OpenFile(path, fmt)\nif err != nil {\n    if strings.Contains(err.Error(), \"reading from the snapshot file\") {\n        return fmt.Errorf(\"snapshot %s is corrupt; re-export required\", path)\n    }\n    return err\n}","preventionTips":["Verify snapshot integrity (size, hash in metadata) before import","Detect aborted exports and delete partial files","Alert on snapshot files of suspiciously small size"],"tags":["io","snapshot","truncated-file","read"],"backgroundTag":"snapshot-file-truncated","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"}