{"record":{"id":"b0b312ff604785d2","repo":"hyperledger/fabric","slug":"error-while-trying-to-see-if-the-leveldb-at-path","errorCode":null,"errorMessage":"error while trying to see if the leveldb at path [%s] is empty","messagePattern":"error while trying to see if the leveldb at path \\[(.+?)\\] is empty","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"common/ledger/util/leveldbhelper/leveldb_helper.go","lineNumber":89,"sourceCode":"\tif dirEmpty, err = fileutil.CreateDirIfMissing(dbPath); err != nil {\n\t\tpanic(fmt.Sprintf(\"Error creating dir if missing: %s\", err))\n\t}\n\tdbOpts.ErrorIfMissing = !dirEmpty\n\tif dbInst.db, err = leveldb.OpenFile(dbPath, dbOpts); err != nil {\n\t\tpanic(fmt.Sprintf(\"Error opening leveldb: %s\", err))\n\t}\n\tdbInst.dbState = opened\n}\n\n// IsEmpty returns whether or not a database is empty\nfunc (dbInst *DB) IsEmpty() (bool, error) {\n\tdbInst.mutex.RLock()\n\tdefer dbInst.mutex.RUnlock()\n\titr := dbInst.db.NewIterator(&goleveldbutil.Range{}, dbInst.readOpts)\n\tdefer itr.Release()\n\thasItems := itr.Next()\n\treturn !hasItems,\n\t\terrors.Wrapf(itr.Error(), \"error while trying to see if the leveldb at path [%s] is empty\", dbInst.conf.DBPath)\n}\n\n// Close closes the underlying db\nfunc (dbInst *DB) Close() {\n\tdbInst.mutex.Lock()\n\tdefer dbInst.mutex.Unlock()\n\tif dbInst.dbState == closed {\n\t\treturn\n\t}\n\tif err := dbInst.db.Close(); err != nil {\n\t\tlogger.Errorf(\"Error closing leveldb: %s\", err)\n\t}\n\tdbInst.dbState = closed\n}\n\n// Get returns the value for the given key\nfunc (dbInst *DB) Get(key []byte) ([]byte, error) {\n\tdbInst.mutex.RLock()","sourceCodeStart":71,"sourceCodeEnd":107,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/common/ledger/util/leveldbhelper/leveldb_helper.go#L71-L107","documentation":"DB.IsEmpty wraps errors from the goleveldb iterator used to test whether the database has any items. It means the emptiness check itself failed (iterator error), not that the DB is empty. Callers use this during ledger format detection (RetrieveDataFormatInfo, openDBAndCheckFormat, checkUpgradeEligibility), so it blocks peer startup format resolution.","triggerScenarios":"Iterator.Error() returns non-nil after NewIterator/Next — typically underlying leveldb corruption, missing/locked DB files, or I/O failure while opening the DB at conf.DBPath.","commonSituations":"Corrupted ledger data directory after a crash; wrong fileLedger/ledgerData path in core.yaml; permission problems on the ledger directory; disk hardware failure.","solutions":["Check filesystem permissions and disk health for the DB path (conf.DBPath).","Inspect peer logs for preceding 'opening leveldb' errors that caused the iterator failure.","Restore the ledger directory from backup or re-provision the peer node if the DB is corrupted.","Verify the configured DBPath in core.yaml points to the intended, existing directory."],"exampleFix":"// before\nempty, err := db.IsEmpty()\nif err != nil { panic(err) }\n// after\nempty, err := db.IsEmpty()\nif err != nil {\n  logger.Fatalf(\"cannot determine format of leveldb at %s: %v\", dbPath, err)\n}","handlingStrategy":"validation","validationCode":"if _, err := os.Stat(dbPath); err != nil {\n  return fmt.Errorf(\"leveldb path %s inaccessible: %w\", dbPath, err)\n}\nif !writable(dbPath) { return fmt.Errorf(\"leveldb path %s not writable\", dbPath) }","typeGuard":"func isEmptyCheckErr(err error) bool {\n  return err != nil && strings.Contains(err.Error(), \"is empty\")\n}","tryCatchPattern":"empty, err := db.IsEmpty()\nif err != nil {\n  logger.Fatalf(\"leveldb at %s unusable, cannot detect data format: %v\", dbPath, err)\n}","preventionTips":["Check disk and permissions on the ledger path before peer start","Do not run the peer against a corrupted or externally modified ledger directory","Back up ledger data before upgrades","Monitor logs for earlier leveldb open errors that precede this one"],"tags":["leveldb","ledger","storage","golang"],"backgroundTag":"leveldb-iterator-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"}