supplemental data between compacting and commit compacting

weed/storage/volume.go

@@ -10,6 +10,11 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 )
 
+type keyField struct {
+	offset uint32
+	size   uint32
+}
+
 type Volume struct {
 	Id            VolumeId
 	dir           string
@@ -23,6 +28,9 @@ type Volume struct {
 
 	dataFileAccessLock sync.Mutex
 	lastModifiedTime   uint64 //unix time in seconds
+
+	lastCompactingIndexOffset       uint64
+	incrementedHasUpdatedIndexEntry map[uint64]keyField
 }
 
 func NewVolume(dirname string, collection string, id VolumeId, needleMapKind NeedleMapType, replicaPlacement *ReplicaPlacement, ttl *TTL) (v *Volume, e error) {