{"record":{"id":"0e5851ebca1abca0","repo":"hyperledger/fabric","slug":"error-truncating-the-file-s-to-size-d","errorCode":null,"errorMessage":"error truncating the file [%s] to size [%d]","messagePattern":"error truncating the file \\[(.+?)\\] to size \\[(.+?)\\]","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"critical","filePath":"common/ledger/blkstorage/blockfile_rw.go","lineNumber":30,"sourceCode":"\t\"github.com/hyperledger/fabric/internal/fileutil\"\n\t\"github.com/pkg/errors\"\n)\n\n// //  WRITER ////\ntype blockfileWriter struct {\n\tfilePath string\n\tfile     *os.File\n}\n\nfunc newBlockfileWriter(filePath string) (*blockfileWriter, error) {\n\twriter := &blockfileWriter{filePath: filePath}\n\treturn writer, writer.open()\n}\n\nfunc (w *blockfileWriter) truncateFile(targetSize int) error {\n\tfileStat, err := w.file.Stat()\n\tif err != nil {\n\t\treturn errors.Wrapf(err, \"error truncating the file [%s] to size [%d]\", w.filePath, targetSize)\n\t}\n\tif fileStat.Size() > int64(targetSize) {\n\t\tw.file.Truncate(int64(targetSize))\n\t}\n\treturn nil\n}\n\nfunc (w *blockfileWriter) append(b []byte, sync bool) error {\n\t_, err := w.file.Write(b)\n\tif err != nil {\n\t\treturn err\n\t}\n\tif sync {\n\t\treturn w.file.Sync()\n\t}\n\treturn nil\n}\n","sourceCodeStart":12,"sourceCodeEnd":48,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/common/ledger/blkstorage/blockfile_rw.go#L12-L48","documentation":"blockfileWriter.truncateFile wraps any failure while inspecting or truncating the underlying block file down to a target size (used by addBlock when recovering from a partial write after a crash). The error wraps either a Stat() failure or reports the target size so operators can identify which segment file and offset were involved.","triggerScenarios":"addBlock calls truncateFile to roll back a partially written block; os.File.Stat() fails (file closed/deleted, permissions, I/O error) and the wrapped error propagates out of the block commit path.","commonSituations":"Disk or filesystem errors on the peer's ledger directory; ledger data files removed or locked while the peer is running; recovery after an unclean shutdown where the file descriptor state is bad; permission changes on /var/hyperledger/production.","solutions":["Check filesystem health and permissions on the ledger's blockfiles directory (ls/stat the reported file path, verify disk is mounted read-write and not full).","Restart the peer to reopen file descriptors if the file was closed or the handle went stale after an unclean shutdown.","Inspect peer logs immediately preceding this error for the root-cause OS error surfaced by errors.Wrapf (it contains the original Stat error).","If the blockstore is corrupt, restore the ledger data from backup or reset/re-bootstrap the peer for the channel."],"exampleFix":"// root-cause: ledger dir not writable\n// before\n# peer starts, addBlock -> Stat fails on read-only mount\n// after\n$ mount -o remount,rw /var/hyperledger\n$ chown -R peer:peer /var/hyperledger/production\n# then restart peer","handlingStrategy":"try-catch","validationCode":"path := filepath.Join(ledgerDir, \"blockfile_000000\")\nif _, err := os.Stat(path); err != nil {\n    return fmt.Errorf(\"blockstore file inaccessible before peer start: %w\", err)\n}\nif err := unix.Access(ledgerDir, unix.W_OK); err != nil {\n    return fmt.Errorf(\"ledger dir not writable: %w\", err)\n}","typeGuard":null,"tryCatchPattern":"err := mgr.addBlock(block)\nif err != nil {\n    var wrapped interface{ Unwrap() error }\n    if errors.As(err, &target) && strings.Contains(err.Error(), \"error truncating the file\") {\n        logger.Criticalf(\"blockfile truncation failed: %v — check disk, permissions, and file state; restart peer\", err)\n    }\n    return err\n}","preventionTips":["Monitor disk health, free space, and mount read-only state on the ledger directory","Keep ledger data files owned by the peer process user with correct permissions","Avoid external processes touching/deleting files under the blockstore directory","After unclean shutdowns, check peer logs for truncation/Stat errors before accepting traffic","Back up the ledger directory so corruption can be restored without data loss"],"tags":["hyperledger-fabric","blockstorage","filesystem","io","truncation"],"backgroundTag":"file-truncate-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"}