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raft: clarify conditions in unstable.stableTo
No change in behavior, but clarify interaction with unstable snapshot. Signed-off-by: Nathan VanBenschoten <nvanbenschoten@gmail.com>
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@ -75,16 +75,20 @@ func (u *unstable) maybeTerm(i uint64) (uint64, bool) {
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func (u *unstable) stableTo(i, t uint64) {
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gt, ok := u.maybeTerm(i)
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if !ok {
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// Unstable entry missing. Ignore.
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return
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}
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// if i < offset, term is matched with the snapshot
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// only update the unstable entries if term is matched with
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// an unstable entry.
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if gt == t && i >= u.offset {
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u.entries = u.entries[i+1-u.offset:]
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u.offset = i + 1
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u.shrinkEntriesArray()
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if i < u.offset {
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// Index matched unstable snapshot, not unstable entry. Ignore.
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return
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}
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if gt != t {
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// Term mismatch between unstable entry and specified entry. Ignore.
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return
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}
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u.entries = u.entries[i+1-u.offset:]
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u.offset = i + 1
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u.shrinkEntriesArray()
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}
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// shrinkEntriesArray discards the underlying array used by the entries slice
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