{"record":{"id":"e4bbb0da044208ce","repo":"benbjohnson/litestream","slug":"close-iterator-w-e4bbb0","errorCode":null,"errorMessage":"close iterator: %w","messagePattern":"close iterator: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"replica.go","lineNumber":1842,"sourceCode":"\t\t\t\t\tPrevFile: prevInfo,\n\t\t\t\t\tCurrFile: info,\n\t\t\t\t})\n\t\t\t} else {\n\t\t\t\terrors = append(errors, ValidationError{\n\t\t\t\t\tLevel:    level,\n\t\t\t\t\tType:     \"overlap\",\n\t\t\t\t\tMessage:  fmt.Sprintf(\"TXID overlap: prev.MaxTXID=%s, curr.MinTXID=%s\", prevInfo.MaxTXID, info.MinTXID),\n\t\t\t\t\tPrevFile: prevInfo,\n\t\t\t\t\tCurrFile: info,\n\t\t\t\t})\n\t\t\t}\n\t\t}\n\n\t\tprevInfo = info\n\t}\n\n\tif err := itr.Close(); err != nil {\n\t\treturn nil, fmt.Errorf(\"close iterator: %w\", err)\n\t}\n\n\treturn errors, nil\n}\n","sourceCodeStart":1824,"sourceCodeEnd":1847,"githubUrl":"https://github.com/benbjohnson/litestream/blob/4ed7a308f6271ebfd2b0a6e4b70b03011a37e4a3/replica.go#L1824-L1847","documentation":"At the end of ValidateLevel, the LTX file iterator must be closed to release backend resources (e.g. finalizing an S3 list operation or closing a local directory iterator). This error wraps itr.Close() failure, which usually reflects an underlying read error encountered while streaming the listing rather than a problem with the validation logic itself.","triggerScenarios":"Calling ValidateLevel when the storage iterator's Close errors: connection dropped mid-listing for remote stores, checksum/IO error reading the local LTX directory listing, or the iterator already consumed/errored in a way the backend reports at close.","commonSituations":"Flaky network to S3/GCS aborting a paginated listing; local disk issues on the replica directory; hitting provider list-request limits during large listings.","solutions":["Retry ValidateLevel — transient listing/network failures typically resolve on retry","Check network stability and provider status if using S3/GS/Azure","If local, check the replica directory on disk for I/O errors (dmesg, SMART)","Note that partial validation results are discarded when Close fails; re-run to get a full report"],"exampleFix":"// before: ignoring iterator close errors in your own code\nitr.Close()\n// after\nif err := itr.Close(); err != nil {\n    return fmt.Errorf(\"close iterator: %w\", err)\n}","handlingStrategy":"retry","validationCode":"ctx, cancel := context.WithTimeout(ctx, 60*time.Second)\ndefer cancel() // ensure listing can complete before Close","typeGuard":null,"tryCatchPattern":"errs, err := r.ValidateLevel(ctx, level)\nif err != nil && strings.Contains(err.Error(), \"close iterator\") {\n    // underlying listing I/O error: retry the whole validation\n    errs, err = r.ValidateLevel(ctx, level)\n}","preventionTips":["Ensure stable network to the storage backend during validation","Avoid aborting validation mid-listing (context cancellation)","Keep replica listings small via retention/compaction to reduce list size","Check provider rate limits if validating many levels in a loop"],"tags":["storage","iterator","network","validation"],"backgroundTag":"api-request-failed","analyzedSha":"4ed7a308f6271ebfd2b0a6e4b70b03011a37e4a3","analyzedAt":"2026-09-06T18:29:25.564Z","contentChangedAt":"2026-09-06T18:29:25.564Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}