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raft: comments for isUpToDate

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This commit is contained in:
Xiang Li 2014-10-25 20:12:54 -07:00
parent 90f26e4a56
commit 8cd95e916d
1 changed files with 7 additions and 2 deletions
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9
raft/log.go
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@ -152,9 +152,14 @@ func (l *raftLog) entries(i uint64) []pb.Entry {
return l.slice(i, l.lastIndex()+1)
}
func (l *raftLog) isUpToDate(i, term uint64) bool {
// isUpToDate determines if the given (lastIndex,term) log is more up-to-date
// by comparing the index and term of the last entries in the existing logs.
// If the logs have last entries with different terms, then the log with the
// later term is more up-to-date. If the logs end with the same term, then
// whichever log has the larger lastIndex is more up-to-date.
func (l *raftLog) isUpToDate(lasti, term uint64) bool {
e := l.at(l.lastIndex())
return term > e.Term || (term == e.Term && i >= l.lastIndex())
return term > e.Term || (term == e.Term && lasti >= l.lastIndex())
}
func (l *raftLog) matchTerm(i, term uint64) bool {