Add queue to prevent writing too many files at once.

store/disk.go

@@ -23,6 +23,7 @@ func init() {
 	writeCh = make(chan writeRequest)
 	for i := 0; i < runtime.NumCPU(); i++ {
 		go func() {
+			for {
 				select {
 				case r := <-writeCh:
 					err := ioutil.WriteFile(r.filename, r.data, r.perm)
@@ -30,6 +31,7 @@ func init() {
 						log.Errorf("could not write file %s to disk, failed with error: %s", r.filename, err.Error())
 					}
 				}
+			}
 		}()
 	}
 }