1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
//! Replay-side handling of the `SEGMENTED` stitch frame: re-establish
//! every row the named segment holds as a seg-backed stub. The rows'
//! write frames precede the stitch in the log — replay brings them in
//! hot and the stitch phase-changes them; a row the log never rebuilt
//! (a rewritten log carries no cold-row commands) is inserted as a
//! stub directly from the segment. A write frame AFTER the stitch is
//! a revival: promote-then-write replaces the stub and the segment
//! record strands. Idempotent — an already-stubbed row is left alone.
use crate::SegRowsError;
use crate::Store;
use crate::value::Value;
impl Store {
/// Apply one `SEGMENTED <file>` frame against this self. The manifest in
/// `segs_dir` is the segment set's truth, fsynced before the frame was
/// logged — a frame naming a segment it does not hold means the truth
/// set was damaged afterwards, and the error is a startup refusal (the
/// rows' only durable copy is unreachable; silence would drop them).
pub fn apply_segmented(
&mut self,
segs_dir: &std::path::Path,
file: &[u8],
) -> Result<u64, SegRowsError> {
let name = str::from_utf8(file).map_err(|_| SegRowsError::NonUtf8Name)?;
self.enable_seg_rows(segs_dir)?;
let Some(seq) = self.row_seg_seq(name) else {
return Err(SegRowsError::NotInManifest {
file: name.to_string(),
dir: segs_dir.to_path_buf(),
});
};
let mut stitched = 0u64;
let records = self.row_seg_records(seq);
for (key, payload) in records {
match self.peek_value_kind(&key) {
RowState::Hot => {
if self.demote_row_to_seg(&key, seq) {
stitched += 1;
}
}
RowState::Absent => {
let weight =
crate::tier_codec::decode(crate::value::COLD_TAG_HASH, payload, &[])
.map_err(|reason| SegRowsError::Record {
file: name.to_string(),
reason,
})?
.weight();
self.insert_row_stub(&key, seq, weight);
stitched += 1;
}
RowState::AlreadyCold | RowState::OtherType => {}
}
}
self.note_stitched(seq, stitched);
Ok(stitched)
}
}
/// What replay found under a stitched key.
pub(crate) enum RowState {
Hot,
Absent,
AlreadyCold,
OtherType,
}
impl Store {
pub(crate) fn peek_value_kind(&mut self, key: &[u8]) -> RowState {
match self.live_entry(key).map(|e| &e.value) {
None => RowState::Absent,
Some(Value::Hash(_) | Value::SmallHashInline(_) | Value::PackedRow(_)) => RowState::Hot,
Some(Value::Cold(_)) => RowState::AlreadyCold,
Some(_) => RowState::OtherType,
}
}
}