{"record":{"id":"f4b34a15910927df","repo":"RyanCodrai/turbovec","slug":"the-v7-file-at-no-longer-matches-this-index-s-l","errorCode":null,"errorMessage":"the v7 file at {} no longer matches this index's last sync (another writer advanced or replaced it); load() the file to adopt its state, or choose a different path","messagePattern":"the v7 file at (.+?) no longer matches this index's last sync \\(another writer advanced or replaced it\\); load\\(\\) the file to adopt its state, or choose a different path","errorType":"validation","errorClass":"io::Error","httpStatus":null,"severity":"error","filePath":"turbovec/src/lib.rs","lineNumber":1861,"sourceCode":"        // Deciding \"full rewrite\" without opening the file would skip\n        // the nonce comparison, and a compaction that renames over a\n        // file another writer has taken over destroys their commits.\n        let bound = matches!(\n            (&self.sync_cursor, &self.sync_path),\n            (Some(_), Some(p)) if p == path\n        );\n        let state = if bound {\n            let c = self.sync_cursor.as_ref().expect(\"checked above\");\n            io_v7::cursor_state(path, c, &geo)?\n        } else {\n            io_v7::CursorState::Replaced\n        };\n        let incremental = bound && {\n            let c = self.sync_cursor.as_ref().expect(\"checked above\");\n            c.calib_gen == self.calib_gen\n        };\n        if matches!(state, io_v7::CursorState::Foreign) {\n            return Err(std::io::Error::new(\n                std::io::ErrorKind::InvalidData,\n                format!(\n                    \"the v7 file at {} no longer matches this index's last sync \\\n                     (another writer advanced or replaced it); load() the file to \\\n                     adopt its state, or choose a different path\",\n                    path.display()\n                ),\n            ));\n        }\n        let result = {\n            let seq_blocks = |from: usize, to: usize| self.seq_blocks_range(from, to);\n            let capture_lookup = self.capture_lookup();\n            let row_codes = |idx: usize, out: &mut Vec<u8>| {\n                match capture_lookup.get(&idx) {\n                    Some(&(off, len)) => {\n                        out.extend_from_slice(&self.sync_capture_buf[off..off + len])\n                    }\n                    None => out.extend_from_slice(&self.seq_row(idx)),","sourceCodeStart":1843,"sourceCodeEnd":1879,"githubUrl":"https://github.com/RyanCodrai/turbovec/blob/ccab9f325e6ce2a270a87daf01ae4e443bcf2d49/turbovec/src/lib.rs#L1843-L1879","documentation":"During v7 sync the library inspects the cursor state of the target file; if it is CursorState::Foreign, the file on disk no longer matches this in-memory index's last sync — another writer advanced or replaced it. To prevent silent data loss or divergence, sync aborts with InvalidData and tells you to load() the file to adopt its state or pick another path.","triggerScenarios":"Calling sync on an index whose sync-bound file was since rewritten by another process/index instance, so io_v7 detects a foreign cursor at path.","commonSituations":"Two processes or two Index instances sharing one file path; a colleague rebuilt the index while your long-lived process held the old state; CI reruns clobbering a shared artifact.","solutions":["Call load() on the file to adopt its newer state into this index, then re-sync","Write to a different, uniquely-owned path (e.g. per-process temp name + atomic rename)","Introduce file locking or a single-writer discipline around the index","Re-open the index from disk instead of reusing stale in-memory state"],"exampleFix":"// before\nidx.sync(path, KIND, None)?; // Err: foreign state\n// after\nmatch idx.sync(path, KIND, None) {\n    Err(e) if e.to_string().contains(\"no longer matches\") => {\n        idx.load(path)?;\n        idx.sync(path, KIND, None)?;\n    }\n    r => r?,\n}","handlingStrategy":"try-catch","validationCode":"let state = turbovec::io_v7::probe_cursor_state(path)?;\nif state == turbovec::io_v7::CursorState::Foreign {\n    idx.load(path)?; // adopt on-disk state before syncing\n}","typeGuard":"fn is_current(idx: &Index, path: &Path) -> bool {\n    !matches!(turbovec::io_v7::probe_cursor_state(path),\n              Ok(turbovec::io_v7::CursorState::Foreign))\n}","tryCatchPattern":"match idx.sync(path, KIND, None) {\n    Err(e) if e.to_string().contains(\"no longer matches this index's last sync\") => {\n        idx.load(path)?;       // adopt the newer on-disk state\n        idx.sync(path, KIND, None)?;\n    }\n    other => other?,\n}","preventionTips":["Enforce single-writer access (lock file or dedicated writer process)","Use unique temp paths + atomic rename for concurrent saves","Reload indexes from disk instead of reusing long-lived stale handles"],"tags":["concurrency","stale-state","v7"],"backgroundTag":"invalid-state-transition","analyzedSha":"ccab9f325e6ce2a270a87daf01ae4e443bcf2d49","analyzedAt":"2026-09-06T08:39:18.516Z","contentChangedAt":"2026-09-06T08:39:18.516Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}