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fix panic on commit index regression #104

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fix panic on commit index regression #104

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6 changes: 5 additions & 1 deletion log.go
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Original file line number Diff line number Diff line change
Expand Up @@ -319,7 +319,11 @@ func (l *raftLog) commitTo(tocommit uint64) {
// never decrease commit
if l.committed < tocommit {
if l.lastIndex() < tocommit {
l.logger.Panicf("tocommit(%d) is out of range [lastIndex(%d)]. Was the raft log corrupted, truncated, or lost?", tocommit, l.lastIndex())
// this can happen when the follower crashed before the commit index persistent
// after the leader received its ack (it is too expensive to do fsync on every write)
l.logger.Warningf("tocommit(%d) is out of range [lastIndex(%d)]. Was the raft log corrupted, truncated, or lost?", tocommit, l.lastIndex())
l.committed = l.lastIndex()
return
}
l.committed = tocommit
}
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12 changes: 3 additions & 9 deletions log_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -615,19 +615,13 @@ func TestCommitTo(t *testing.T) {
tests := []struct {
commit uint64
wcommit uint64
wpanic bool
}{
{3, 3, false},
{1, 2, false}, // never decrease
{4, 0, true}, // commit out of range -> panic
{3, 3},
{1, 2}, // never decrease
{4, 3}, // commit out of range -> recover
}
for i, tt := range tests {
t.Run(fmt.Sprint(i), func(t *testing.T) {
defer func() {
if r := recover(); r != nil {
require.True(t, tt.wpanic)
}
}()
raftLog := newLog(NewMemoryStorage(), raftLogger)
raftLog.append(previousEnts...)
raftLog.committed = commit
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