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raft: address issues in comments

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This commit is contained in:
Xiang Li 2014-10-27 11:09:44 -07:00
parent 94f701cf95
commit 460d6490ba
2 changed files with 14 additions and 11 deletions
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17
raft/log.go
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@ -84,16 +84,18 @@ func (l *raftLog) append(after uint64, ents ...pb.Entry) uint64 {
}
// findConflict finds the index of the conflict.
// It returns the the first pair of confilcting entries between the existing
// entries and the given entries, if there is any.
// It returns the first pair of conflicting entries between the existing
// entries and the given entries, if there are any.
// If there is no conflicting entries, and the existing entries contains
// all the given entries, zero will be returned.
// If there is no conflicting entries, but the given entries contains new
// entries, the index of the first new entry will be returned.
// Conflicting entries has the same index but different term.
// The first given entry MUST have the index equal to from.
// The index of the given entries MUST be continously increasing.
// An entry is considered to be conflicting if it has the same index but
// a different term.
// The first entry MUST have an index equal to the argument 'from'.
// The index of the given entries MUST be continuously increasing.
func (l *raftLog) findConflict(from uint64, ents []pb.Entry) uint64 {
// TODO(xiangli): validate the index of ents
for i, ne := range ents {
if oe := l.at(from + uint64(i)); oe == nil || oe.Term != ne.Term {
return from + uint64(i)
@ -133,7 +135,7 @@ func (l *raftLog) resetNextEnts() {
func (l *raftLog) lastIndex() uint64 { return uint64(len(l.ents)) - 1 + l.offset }
func (l raftLog) lastTerm() uint64 { return l.term(l.lastIndex()) }
func (l *raftLog) lastTerm() uint64 { return l.term(l.lastIndex()) }
func (l *raftLog) term(i uint64) uint64 {
if e := l.at(i); e != nil {
@ -156,7 +158,8 @@ func (l *raftLog) entries(i uint64) []pb.Entry {
// 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.
// whichever log has the larger lastIndex is more up-to-date. If the logs are
// the same, the given log is up-to-date.
func (l *raftLog) isUpToDate(lasti, term uint64) bool {
return term > l.lastTerm() || (term == l.lastTerm() && lasti >= l.lastIndex())
}

8
raft/log_test.go
View File

@ -50,7 +50,7 @@ func TestFindConflict(t *testing.T) {
for i, tt := range tests {
raftLog := newLog()
raftLog.ents = append(raftLog.ents, previousEnts...)
raftLog.append(raftLog.lastIndex(), previousEnts...)
gconflict := raftLog.findConflict(tt.from, tt.ents)
if gconflict != tt.wconflict {
@ -62,7 +62,7 @@ func TestFindConflict(t *testing.T) {
func TestIsUpToDate(t *testing.T) {
previousEnts := []pb.Entry{{Term: 1}, {Term: 2}, {Term: 3}}
raftLog := newLog()
raftLog.ents = append(raftLog.ents, previousEnts...)
raftLog.append(raftLog.lastIndex(), previousEnts...)
tests := []struct {
lastIndex uint64
term uint64
@ -139,7 +139,7 @@ func TestAppend(t *testing.T) {
for i, tt := range tests {
raftLog := newLog()
raftLog.ents = append(raftLog.ents, previousEnts...)
raftLog.append(raftLog.lastIndex(), previousEnts...)
raftLog.unstable = previousUnstable
index := raftLog.append(tt.after, tt.ents...)
if index != tt.windex {
@ -219,7 +219,7 @@ func TestUnstableEnts(t *testing.T) {
for i, tt := range tests {
raftLog := newLog()
raftLog.ents = append(raftLog.ents, previousEnts...)
raftLog.append(0, previousEnts...)
raftLog.unstable = tt.unstable
ents := raftLog.unstableEnts()
raftLog.resetUnstable()