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write requests also checks cookie if overwrites

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protect against edge cases, avoid https://github.com/chrislusf/seaweedfs/issues/1014
This commit is contained in:
Chris Lu 2019-07-17 23:57:34 -07:00
parent 898d943b25
commit c54d9221b9
1 changed files with 17 additions and 1 deletions
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18
weed/storage/volume_read_write.go
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@ -96,13 +96,29 @@ func (v *Volume) writeNeedle(n *needle.Needle) (offset uint64, size uint32, isUn
n.Ttl = v.Ttl
}
// check whether existing needle cookie matches
nv, ok := v.nm.Get(n.Id)
if ok {
existingNeedle, _, _, existingNeedleReadErr := needle.ReadNeedleHeader(v.dataFile, v.Version(), nv.Offset.ToAcutalOffset())
if existingNeedleReadErr != nil {
err = fmt.Errorf("reading existing needle: %v", existingNeedleReadErr)
return
}
if existingNeedle.Cookie != n.Cookie {
glog.V(0).Infof("write cookie mismatch: existing %x, new %x", existingNeedle.Cookie, n.Cookie)
err = fmt.Errorf("mismatching cookie %x", n.Cookie)
return
}
}
// append to dat file
n.AppendAtNs = uint64(time.Now().UnixNano())
if offset, size, _, err = n.Append(v.dataFile, v.Version()); err != nil {
return
}
v.lastAppendAtNs = n.AppendAtNs
nv, ok := v.nm.Get(n.Id)
// add to needle map
if !ok || uint64(nv.Offset.ToAcutalOffset()) < offset {
if err = v.nm.Put(n.Id, ToOffset(int64(offset)), n.Size); err != nil {
glog.V(4).Infof("failed to save in needle map %d: %v", n.Id, err)