{"record":{"id":"9837f107d51c4540","repo":"hyperledger/fabric","slug":"error-while-closing-the-snapshot-file-s","errorCode":null,"errorMessage":"error while closing the snapshot file: %s ","messagePattern":"error while closing the snapshot file: (.+?) ","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"common/ledger/snapshot/file.go","lineNumber":108,"sourceCode":"// 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}\n\n// FileReader reads from a ledger snapshot file. This is expected to be used for loading the ledger snapshot data\n// during bootstrapping a channel from snapshot. The data should be read, using the functions `DecodeXXX`,\n// in the same sequence in which the data was written by the functions `EncodeXXX` in the `FileCreator`.\n// Note that the FileReader does not verify the hash of stream and it is expected that the hash has been verified\n// by the consumer. Later, if we decide to perform this, on-the-side, while loading the snapshot data, the FileRedear,","sourceCodeStart":90,"sourceCodeEnd":126,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/common/ledger/snapshot/file.go#L90-L126","documentation":"Done calls c.file.Sync() to force written data to stable storage; if the OS-level sync fails, the raw error is returned (no wrap). A failure here means data may not be durably persisted and the snapshot cannot be trusted as complete. The hash is not returned because the file finalization did not succeed.","triggerScenarios":"c.file.Sync() returns an error during Done (after a successful Flush).","commonSituations":"ENOSPC/EIO on the underlying storage, NFS/network filesystems that don't support fsync properly, or container storage drivers rejecting fsync.","solutions":["Inspect the raw OS error returned by Sync","Avoid snapshot output on network filesystems with unreliable fsync; write to local disk","Retry the export and verify the resulting snapshot hash"],"exampleFix":null,"handlingStrategy":"retry","validationCode":"if err := syscall.Access(snapshotDir, os.O_RDWR); err != nil { return errors.New(\"snapshot dir not writable\") }","typeGuard":null,"tryCatchPattern":"hash, err := w.Done()\nif err != nil {\n    log.Errorf(\"sync/close failed for snapshot %s: %v\", path, err)\n    w.Close(); return err // retry the whole export\n}","preventionTips":["Prefer local filesystems with reliable fsync over NFS","Retry the entire export if Sync fails — the snapshot is not durable","Monitor storage health (EIO) on the node"],"tags":["io","snapshot","fsync","durability"],"backgroundTag":"fsync-failed","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"}