{"record":{"id":"7fc5e136f78834fd","repo":"hyperledger/fabric","slug":"error-while-writing-data-format-to-the-snapshot-fi","errorCode":null,"errorMessage":"error while writing data format to the snapshot file: %s","messagePattern":"error while writing data format to the snapshot file: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"common/ledger/snapshot/file.go","lineNumber":51,"sourceCode":"// CreateFile creates a new file for exporting the ledger snapshot data\n// This function returns an error if the file already exists. The `dataformat` is the first byte\n// written to the file. The function newHash is used to construct an hash.Hash for computing the hash-sum of the data stream\nfunc CreateFile(filePath string, dataformat byte, newHashFunc NewHashFunc) (*FileWriter, error) {\n\thashImpl, err := newHashFunc()\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\t// create the file only if it does not already exist.\n\t// set the permission mode to read-only, as once the file is closed, we do not support modifying the file\n\tfile, err := os.OpenFile(filePath, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0o444)\n\tif err != nil {\n\t\treturn nil, errors.Wrapf(err, \"error while creating the snapshot file: %s\", filePath)\n\t}\n\tbufWriter := bufio.NewWriter(file)\n\tmultiWriter := io.MultiWriter(bufWriter, hashImpl)\n\tif _, err := multiWriter.Write([]byte{dataformat}); err != nil {\n\t\tfile.Close()\n\t\treturn nil, errors.Wrapf(err, \"error while writing data format to the snapshot file: %s\", filePath)\n\t}\n\treturn &FileWriter{\n\t\tfile:              file,\n\t\tbufWriter:         bufWriter,\n\t\tmultiWriter:       multiWriter,\n\t\thasher:            hashImpl,\n\t\tvarintReusableBuf: make([]byte, binary.MaxVarintLen64),\n\t}, nil\n}\n\n// EncodeString encodes and appends the string to the data stream\nfunc (c *FileWriter) EncodeString(str string) error {\n\treturn c.EncodeBytes([]byte(str))\n}\n\n// EncodeProtoMessage encodes and appends a proto message to the data stream\nfunc (c *FileWriter) EncodeProtoMessage(m proto.Message) error {\n\tif m == nil || !m.ProtoReflect().IsValid() {","sourceCodeStart":33,"sourceCodeEnd":69,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/common/ledger/snapshot/file.go#L33-L69","documentation":"Returned by snapshot CreateFile when writing the one-byte data-format header to the just-created snapshot file fails. The file exists but the initial write errored (I/O failure or closed stream), so the writer cannot be returned.","triggerScenarios":"Thrown at common/ledger/snapshot/file.go:51 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Free disk space on the snapshot volume and retry the snapshot export","Check the wrapped error for the OS-level write failure"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"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"}