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Merge pull request #1820 from xiang90/fix_storage

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raft: fix memory storage
This commit is contained in:
Xiang Li 2014-12-01 21:25:17 -08:00
commit cb74b6812b
1 changed files with 20 additions and 6 deletions
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24
raft/storage.go
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@ -179,13 +179,27 @@ func (ms *MemoryStorage) Append(entries []pb.Entry) {
if len(entries) == 0 { if len(entries) == 0 {
return return
} }
offset := entries[0].Index - ms.snapshot.Metadata.Index first := ms.snapshot.Metadata.Index + 1
// do not append out of date entries last := entries[0].Index + uint64(len(entries)) - 1
if offset < 0 {
// shortcut if there is no new entry.
if last < first {
return return
} }
if uint64(len(ms.ents)) > offset { // truncate old entries
ms.ents = append([]pb.Entry{}, ms.ents[:offset]...) if first > entries[0].Index {
entries = entries[first-entries[0].Index:]
} }
offset := entries[0].Index - ms.snapshot.Metadata.Index
switch {
case uint64(len(ms.ents)) > offset:
ms.ents = append([]pb.Entry{}, ms.ents[:offset]...)
ms.ents = append(ms.ents, entries...) ms.ents = append(ms.ents, entries...)
case uint64(len(ms.ents)) == offset:
ms.ents = append(ms.ents, entries...)
default:
log.Panicf("missing log entry [last: %d, append at: %d]",
ms.snapshot.Metadata.Index+uint64(len(ms.ents)), entries[0].Index)
}
} }