- rdr, err := v.bsClient.GetBlob(v.containerName, loc)
- if err != nil {
- if strings.Contains(err.Error(), "404 Not Found") {
- // "storage: service returned without a response body (404 Not Found)"
- return nil, os.ErrNotExist
+ var deadline time.Time
+ haveDeadline := false
+ buf, err := v.get(loc)
+ for err == nil && len(buf) == 0 && loc != "d41d8cd98f00b204e9800998ecf8427e" {
+ // Seeing a brand new empty block probably means we're
+ // in a race with CreateBlob, which under the hood
+ // (apparently) does "CreateEmpty" and "CommitData"
+ // with no additional transaction locking.
+ if !haveDeadline {
+ t, err := v.Mtime(loc)
+ if err != nil {
+ log.Print("Got empty block (possible race) but Mtime failed: ", err)
+ break
+ }
+ deadline = t.Add(azureWriteRaceInterval)
+ if time.Now().After(deadline) {
+ break
+ }
+ log.Printf("Race? Block %s is 0 bytes, %s old. Polling until %s", loc, time.Since(t), deadline)
+ haveDeadline = true
+ } else if time.Now().After(deadline) {
+ break