{"record":{"id":"eb231c76fea61e14","repo":"hyperledger/fabric","slug":"error-while-flushing-to-the-snapshot-file-s","errorCode":null,"errorMessage":"error while flushing to the snapshot file: %s ","messagePattern":"error while flushing to the snapshot file: (.+?) ","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"common/ledger/snapshot/file.go","lineNumber":102,"sourceCode":"\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}\n\tif err := c.file.Sync(); err != nil {\n\t\treturn nil, err\n\t}\n\tif err := c.file.Close(); err != nil {\n\t\treturn nil, errors.Wrapf(err, \"error while closing the snapshot file: %s \", c.file.Name())\n\t}\n\treturn c.hasher.Sum(nil), nil\n}\n\n// Close closes the underlying file, if not already done. A consumer can invoke this function if the consumer\n// encountered some error and simply wants to abandon the snapshot file creation (typically, intended to be used in a defer statement)\nfunc (c *FileWriter) Close() error {\n\tif c == nil {\n\t\treturn nil\n\t}\n\treturn errors.Wrapf(c.file.Close(), \"error while closing the snapshot file: %s\", c.file.Name())\n}","sourceCodeStart":84,"sourceCodeEnd":120,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/common/ledger/snapshot/file.go#L84-L120","documentation":"Done finalizes the snapshot: it flushes the buffered writer, then syncs and closes the file, returning the running hash. This error means the bufio flush to the snapshot file failed, so buffered data never reached the file and the snapshot is incomplete. Note the trailing space in the message string is part of the format.","triggerScenarios":"c.bufWriter.Flush() returns an error when Done is called (from exportUniqueTxIDs, ExportConfigHistory, or nested Done calls).","commonSituations":"Filesystem became full only at flush time (buffered writes deferred the failure), file handle invalidated, or an underlying disk I/O error surfacing at flush.","solutions":["Check disk space and the wrapped OS error from Flush","Re-run the snapshot export to produce a complete file","Ensure Done() is called exactly once and Close() is only used on the error path"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"// before Done: ensure buffered data fits and disk has headroom\nif free, _ := diskFree(snapshotDir); free < estimatedSize { return errors.New(\"not enough space to finalize snapshot\") }","typeGuard":null,"tryCatchPattern":"hash, err := w.Done()\nif err != nil {\n    w.Close() // best-effort cleanup\n    return fmt.Errorf(\"snapshot finalization failed: %w\", err)\n}","preventionTips":["Call Done exactly once; use Close only for abandon paths","Reserve disk headroom larger than the largest expected buffer flush","Log the wrapped inner error from Flush for storage diagnosis"],"tags":["io","snapshot","flush","buffer"],"backgroundTag":"flush-failed-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"}