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feat(raft-ha-core-safety): establish snapshot (term,lsn) boundary on install (task 3.2)

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Adds checkpointTerm (@6, append-only) to the SnapshotTransfer wire
message. The leader stamps it via persist_entry_term(p, checkpoint_lsn)
when sending a snapshot; the standby reconciles it into its own
per-LSN term index (persist_reconcile_checkpoint_term) right after
persist_load_snapshot succeeds, before applied_lsn advances. This
authoritatively overwrites any stale local term a divergent
pre-snapshot entry left at the checkpoint LSN, closing the gap task
3.1's RED test proved (Expected 7 Was 3 -> now passes). Transport
stays persist_t-free; the reconcile lives in persist.c per the
existing dependency direction. Decode is auto-generated via capnp
mapname; only the hand-rolled encode path (request.c/typemap.h, needed
for the raw snapshot payload) required a matching manual update.

test_ha_core_safety 25/0, test_config_repl 66/0, no ASAN reports.
This commit is contained in:
Rongsong Shen 2026-07-01 13:08:10 +00:00
parent 21858faba4
commit a53b9a7b6c
11 changed files with 132 additions and 23 deletions
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13
src/lib/request.c
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@ -632,11 +632,14 @@ int xce_snapshot_chunk_encode_raw(const snapshot_transfer_t *chunk,
memset(&rq, 0, sizeof(rq));
memset(&st, 0, sizeof(st));
st.snapshotLsn = chunk->snapshot_lsn;
st.chunkIndex = chunk->chunk_index;
st.chunkOffset = chunk->chunk_offset;
st.totalSize = chunk->total_size;
st.isLast = chunk->is_last ? 1 : 0;
st.snapshotLsn = chunk->snapshot_lsn;
st.chunkIndex = chunk->chunk_index;
st.chunkOffset = chunk->chunk_offset;
st.totalSize = chunk->total_size;
st.isLast = chunk->is_last ? 1 : 0;
/* raft-ha-core-safety task 3.2: checkpoint's term at snapshotLsn, so the
* receiver can reconcile its per-LSN term index at the boundary. */
st.checkpointTerm = chunk->checkpoint_term;
if (payload && payload_len > 0) {
capn_list8 pl = capn_new_list8(cs, (int)payload_len);
capn_setv8(pl, 0, payload, (int)payload_len);