{"record":{"id":"bb207cc3219e08b4","repo":"clockworklabs/SpacetimeDB","slug":"repo-first-commit-in-the-most-recent-segment-i","errorCode":null,"errorMessage":"repo {}: first commit in the most recent segment is corrupt: {}","messagePattern":"repo (.+?): first commit in the most recent segment is corrupt: (.+?)","errorType":"exception","errorClass":"std::io::Error","httpStatus":null,"severity":"critical","filePath":"crates/commitlog/src/commitlog.rs","lineNumber":483,"sourceCode":"            // Segment is intact.\n            Ok(metadata) if empty_segments <= 1 => {\n                assert!(\n                    !metadata.tx_range.is_empty(),\n                    \"segment was promised to be non-empty but contains zero transactions\"\n                );\n                Ok(Some(CommittedMeta::Complete { metadata }))\n            }\n            // Segment is good, but there are too many empty segments.\n            Ok(metadata) => Ok(Some(CommittedMeta::Prefix {\n                metadata,\n                error: io::Error::new(\n                    io::ErrorKind::InvalidData,\n                    format!(\"repo {}: too many empty segments: {}\", repo, empty_segments),\n                ),\n            })),\n            // Segment is non-empty, but first commit is corrupt.\n            Err(error::SegmentMetadata::InvalidCommit { sofar, source }) if sofar.tx_range.is_empty() => {\n                Err(io::Error::new(\n                    io::ErrorKind::InvalidData,\n                    format!(\n                        \"repo {}: first commit in the most recent segment is corrupt: {}\",\n                        repo, source\n                    ),\n                ))\n            }\n            // Some prefix of the segment is good.\n            Err(error::SegmentMetadata::InvalidCommit { sofar, source }) => Ok(Some(CommittedMeta::Prefix {\n                metadata: sofar,\n                error: source,\n            })),\n            // Something went wrong, including out-of-order errors and such.\n            Err(error::SegmentMetadata::Io(e)) => Err(e),\n        }\n    }\n}\n","sourceCodeStart":465,"sourceCodeEnd":501,"githubUrl":"https://github.com/clockworklabs/SpacetimeDB/blob/9e0d92412ff2248f401a8ad12d535f2b5ac30912/crates/commitlog/src/commitlog.rs#L465-L501","documentation":"Hard recovery failure from CommittedMeta::extract: while extracting metadata for the most recent non-empty segment, the very first commit failed to decode. Because no earlier commit in that segment survived, there is no prefix to fall back to, so the function returns InvalidData instead of a CommittedMeta::Prefix. Typically the first commit of a fresh segment was torn by a crash mid-write, or the segment's first bytes are corrupted.","triggerScenarios":"The node crashed while writing the first commit of a newly created segment (header written, payload or checksum missing); or the first bytes of the newest segment were corrupted on disk. Reopening the log cannot salvage that segment.","commonSituations":"Power loss or kill -9 right after segment rollover; bit rot on the newest segment; partially copied or restored data directories.","solutions":["Delete (or move aside) the damaged newest segment file and let the log continue from the previous segment - commits in that segment are lost, older segments are untouched.","If the data matters, restore the data directory from a snapshot or replica instead of dropping the segment.","Prevent recurrence: graceful shutdowns, durable disk, no external truncation of segment files."],"exampleFix":null,"handlingStrategy":"fallback","validationCode":null,"typeGuard":null,"tryCatchPattern":"let meta = match committed_meta(repo.clone()) {\n    Ok(m) => m,\n    Err(e) if e.kind() == io::ErrorKind::InvalidData => {\n        // newest segment's first commit is torn: quarantine it and retry open once\n        quarantine_newest_segment(&repo)?;\n        committed_meta(repo)?\n    }\n    Err(e) => return Err(e.into()),\n};","preventionTips":["Take periodic snapshots so losing the newest segment never means losing data.","Stop nodes gracefully - the first commit of a fresh segment is the most crash-exposed write in the log.","Never hand-edit or partially copy segment files into the data directory."],"tags":["rust","commitlog","corruption","recovery","segment"],"backgroundTag":"corrupt-commit-segment","analyzedSha":"9e0d92412ff2248f401a8ad12d535f2b5ac30912","analyzedAt":"2026-08-20T06:08:37.179Z","contentChangedAt":"2026-08-20T06:08:37.179Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}