{"record":{"id":"8d89f309d9e35798","repo":"hyperledger/fabric","slug":"error-while-writing-data-to-the-snapshot-file-s","errorCode":null,"errorMessage":"error while writing data to the snapshot file: %s","messagePattern":"error while writing data to the snapshot file: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"common/ledger/snapshot/file.go","lineNumber":85,"sourceCode":"// 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() {\n\t\treturn errors.Errorf(\"error marshalling proto message to write to the snapshot file: %s: proto: Marshal called with nil\", c.file.Name())\n\t}\n\tb, err := proto.Marshal(m)\n\tif err != nil {\n\t\treturn errors.Wrapf(err, \"error marshalling proto message to write to the snapshot file: %s\", c.file.Name())\n\t}\n\treturn c.EncodeBytes(b)\n}\n\n// EncodeBytes encodes and appends bytes to the data stream\nfunc (c *FileWriter) EncodeBytes(b []byte) error {\n\tif err := c.EncodeUVarint(uint64(len(b))); err != nil {\n\t\treturn err\n\t}\n\tif _, err := c.multiWriter.Write(b); err != nil {\n\t\treturn errors.Wrapf(err, \"error while writing data to the snapshot file: %s\", c.file.Name())\n\t}\n\treturn nil\n}\n\n// EncodeUVarint encodes and appends a number to the data stream\nfunc (c *FileWriter) EncodeUVarint(u uint64) error {\n\tn := binary.PutUvarint(c.varintReusableBuf, u)\n\tif _, err := c.multiWriter.Write(c.varintReusableBuf[:n]); err != nil {\n\t\treturn errors.Wrapf(err, \"error while writing data to the snapshot file: %s\", c.file.Name())\n\t}\n\treturn nil\n}\n\n// Done closes the snapshot file and returns the final hash of the data stream\nfunc (c *FileWriter) Done() ([]byte, error) {\n\tif err := c.bufWriter.Flush(); err != nil {\n\t\treturn nil, errors.Wrapf(err, \"error while flushing to the snapshot file: %s \", c.file.Name())\n\t}","sourceCodeStart":67,"sourceCodeEnd":103,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/common/ledger/snapshot/file.go#L67-L103","documentation":"EncodeBytes writes a uvarint length prefix followed by the raw bytes to the snapshot file's multiWriter (file + buffered hash writer). This error means the Write call on the data bytes failed after the length prefix may already have been written, so the snapshot stream is potentially truncated. The wrapped OS error gives the concrete cause (disk full, bad fd, etc.).","triggerScenarios":"c.multiWriter.Write(b) returns an error while encoding bytes appended via EncodeString, EncodeProtoMessage, or ExportConfigHistory.","commonSituations":"Disk quota exceeded or filesystem full on the snapshot output directory; snapshot file deleted/rotated mid-write; running out of file descriptors or hitting an I/O error on a network-backed volume.","solutions":["Check free disk space on the snapshot output path","Inspect the wrapped inner error for the OS-level cause","Retry the snapshot export after resolving the storage issue"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"if st, err := os.Stat(outDir); err != nil || !st.IsDir() { return errors.New(\"invalid snapshot dir\") }\nif us := getFreeSpace(outDir); us < minRequired { return errors.New(\"insufficient disk space\") }","typeGuard":null,"tryCatchPattern":"if err := w.EncodeBytes(data); err != nil {\n    var pe *fs.PathError\n    if errors.As(err, &pe) { log.Errorf(\"snapshot write failed: %v\", pe) }\n    w.Close() // abandon snapshot\n    return err\n}","preventionTips":["Check free disk space before starting an export","Write snapshots to local, not network, storage","Always defer Close() on error paths to avoid partial files"],"tags":["io","snapshot","disk","write"],"backgroundTag":"disk-full-io-error","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"}