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raft: clean up storage

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Xiang Li 2015-01-28 10:31:11 -08:00 committed by Yicheng Qin
parent 8fb6eb6c70
commit cbef6ab152
2 changed files with 32 additions and 8 deletions
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27
raft/storage.go
View File

@ -100,6 +100,9 @@ func (ms *MemoryStorage) Entries(lo, hi uint64) ([]pb.Entry, error) {
if lo <= offset {
return nil, ErrCompacted
}
if hi > ms.lastIndex()+1 {
log.Panicf("entries's hi(%d) is out of bound lastindex(%d)", hi, ms.lastIndex())
}
// only contains dummy entries.
if len(ms.ents) == 1 {
return nil, ErrUnavailable
@ -122,14 +125,22 @@ func (ms *MemoryStorage) Term(i uint64) (uint64, error) {
func (ms *MemoryStorage) LastIndex() (uint64, error) {
ms.Lock()
defer ms.Unlock()
return ms.ents[0].Index + uint64(len(ms.ents)) - 1, nil
return ms.lastIndex(), nil
}
func (ms *MemoryStorage) lastIndex() uint64 {
return ms.ents[0].Index + uint64(len(ms.ents)) - 1
}
// FirstIndex implements the Storage interface.
func (ms *MemoryStorage) FirstIndex() (uint64, error) {
ms.Lock()
defer ms.Unlock()
return ms.ents[0].Index + 1, nil
return ms.firstIndex(), nil
}
func (ms *MemoryStorage) firstIndex() uint64 {
return ms.ents[0].Index + 1
}
// Snapshot implements the Storage interface.
@ -163,8 +174,8 @@ func (ms *MemoryStorage) CreateSnapshot(i uint64, cs *pb.ConfState, data []byte)
}
offset := ms.ents[0].Index
if i > offset+uint64(len(ms.ents))-1 {
log.Panicf("snapshot %d is out of bound lastindex(%d)", i, offset+uint64(len(ms.ents))-1)
if i > ms.lastIndex() {
log.Panicf("snapshot %d is out of bound lastindex(%d)", i, ms.lastIndex())
}
ms.snapshot.Metadata.Index = i
@ -184,8 +195,8 @@ func (ms *MemoryStorage) Compact(compactIndex uint64) error {
if compactIndex <= offset {
return ErrCompacted
}
if compactIndex > offset+uint64(len(ms.ents))-1 {
log.Panicf("compact %d is out of bound lastindex(%d)", compactIndex, offset+uint64(len(ms.ents))-1)
if compactIndex > ms.lastIndex() {
log.Panicf("compact %d is out of bound lastindex(%d)", compactIndex, ms.lastIndex())
}
i := compactIndex - offset
@ -213,7 +224,7 @@ func (ms *MemoryStorage) Append(entries []pb.Entry) error {
if last < first {
return nil
}
// truncate old entries
// truncate compacted entries
if first > entries[0].Index {
entries = entries[first-entries[0].Index:]
}
@ -227,7 +238,7 @@ func (ms *MemoryStorage) Append(entries []pb.Entry) error {
ms.ents = append(ms.ents, entries...)
default:
log.Panicf("missing log entry [last: %d, append at: %d]",
ms.ents[0].Index+uint64(len(ms.ents)), entries[0].Index)
ms.lastIndex(), entries[0].Index)
}
return nil
}

13
raft/storage_test.go
View File

@ -203,6 +203,19 @@ func TestStorageAppend(t *testing.T) {
nil,
[]pb.Entry{{Index: 3, Term: 3}, {Index: 4, Term: 4}, {Index: 5, Term: 5}, {Index: 6, Term: 5}},
},
// truncate incoming entries, truncate the existing entries and append
{
[]pb.Entry{{Index: 2, Term: 3}, {Index: 3, Term: 3}, {Index: 4, Term: 5}},
nil,
[]pb.Entry{{Index: 3, Term: 3}, {Index: 4, Term: 5}},
},
// tunncate the existing entries and append
{
[]pb.Entry{{Index: 4, Term: 5}},
nil,
[]pb.Entry{{Index: 3, Term: 3}, {Index: 4, Term: 5}},
},
// direct append
{
[]pb.Entry{{Index: 6, Term: 5}},
nil,