{"record":{"id":"6289892110971865","repo":"nautechsystems/nautilus_trader","slug":"failed-to-reset-file-position-for-after-max","errorCode":null,"errorMessage":"Failed to reset file position for '{}' after {MAX_RETRIES} attempts: {e}","messagePattern":"Failed to reset file position for '(.+?)' after (.+?) attempts: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/adapters/tardis/src/csv/mod.rs","lineNumber":157,"sourceCode":"                );\n                std::thread::sleep(Duration::from_millis(DELAY_MS));\n            }\n        }\n    }\n\n    if header_buf[0] != 0x1f || header_buf[1] != 0x8b {\n        anyhow::bail!(\n            \"File '{}' has .gz extension but invalid gzip header\",\n            filepath_ref.display()\n        );\n    }\n\n    for attempt in 1..=MAX_RETRIES {\n        match file.seek(SeekFrom::Start(0)) {\n            Ok(_) => break,\n            Err(e) => {\n                if attempt == MAX_RETRIES {\n                    anyhow::bail!(\n                        \"Failed to reset file position for '{}' after {MAX_RETRIES} attempts: {e}\",\n                        filepath_ref.display()\n                    );\n                }\n                log::warn!(\n                    \"Attempt {attempt}/{MAX_RETRIES} failed to seek in '{}': {e}. Retrying after {DELAY_MS}ms...\",\n                    filepath_ref.display()\n                );\n                std::thread::sleep(Duration::from_millis(DELAY_MS));\n            }\n        }\n    }\n\n    let buf_reader = BufReader::with_capacity(BUFFER_SIZE, file);\n    let decoder = GzDecoder::new(buf_reader);\n\n    Ok(ReaderBuilder::new()\n        .has_headers(true)","sourceCodeStart":139,"sourceCodeEnd":175,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/tardis/src/csv/mod.rs#L139-L175","documentation":"After checking the gzip header, create_csv_reader rewinds the file to offset 0 (with retries) so the CSV reader starts from the beginning. This error is thrown when all seek attempts fail, typically because the underlying file descriptor is in an unrecoverable error state.","triggerScenarios":"Calling a Tardis CSV loader where `file.seek(SeekFrom::Start(0))` fails MAX_RETRIES consecutive times — usually an I/O error on the file handle (e.g. the file was removed or the descriptor went bad after the header read).","commonSituations":"File on a network mount that dropped mid-open; file deleted/replaced between open and seek; disk I/O errors; extremely rare transient kernel-level failures on the descriptor.","solutions":["Re-run the loader; transient I/O errors often resolve on retry","Verify the file still exists and is readable: `ls -l` and `head -c 2 file`","Re-open the file from scratch (restart the process) to get a fresh descriptor","Check storage health / network mount stability if it reproduces"],"exampleFix":"// before\nlet reader = create_csv_reader(&path)?;  // fails after retries\n// after: verify file health before loading\nlet metadata = std::fs::metadata(&path)?;  // errors early if file is gone\nlet reader = create_csv_reader(&path)?;","handlingStrategy":"retry","validationCode":"let meta = std::fs::metadata(&path)?; // fails early if file vanished\nlet mut probe = std::fs::File::open(&path)?;\nprobe.seek(std::io::SeekFrom::Start(0))?; // exercise seek before loader","typeGuard":null,"tryCatchPattern":"// retry the whole load at a higher level; internal retries already exhausted\nfor _ in 0..3 {\n    match loader.load_trades(&path) {\n        Ok(d) => break,\n        Err(e) if e.to_string().contains(\"Failed to reset file position\") => continue,\n        Err(e) => return Err(e),\n    }\n}","preventionTips":["Avoid loading files from flaky network mounts; copy to local disk first","Don't mutate/delete files while a reader holds them open","Treat repeated seek failures as a disk/storage health signal"],"tags":["io","seek","retry","csv"],"backgroundTag":"file-read-failed","analyzedSha":"18893faf8b356be3320add8de2f861b0b647cf06","analyzedAt":"2026-09-08T20:49:34.690Z","contentChangedAt":"2026-09-08T20:49:34.690Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}