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raft: clarify conditions in unstable.stableTo

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No change in behavior, but clarify interaction with unstable snapshot.

Signed-off-by: Nathan VanBenschoten <nvanbenschoten@gmail.com>
This commit is contained in:
Nathan VanBenschoten 2022-09-25 20:46:03 -04:00
parent 0bff3ade4d
commit c18d79df37
1 changed files with 11 additions and 7 deletions
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18
raft/log_unstable.go
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@ -75,16 +75,20 @@ func (u *unstable) maybeTerm(i uint64) (uint64, bool) {
func (u *unstable) stableTo(i, t uint64) {
gt, ok := u.maybeTerm(i)
if !ok {
// Unstable entry missing. Ignore.
return
}
// if i < offset, term is matched with the snapshot
// only update the unstable entries if term is matched with
// an unstable entry.
if gt == t && i >= u.offset {
u.entries = u.entries[i+1-u.offset:]
u.offset = i + 1
u.shrinkEntriesArray()
if i < u.offset {
// Index matched unstable snapshot, not unstable entry. Ignore.
return
}
if gt != t {
// Term mismatch between unstable entry and specified entry. Ignore.
return
}
u.entries = u.entries[i+1-u.offset:]
u.offset = i + 1
u.shrinkEntriesArray()
}
// shrinkEntriesArray discards the underlying array used by the entries slice