clean up log fmt usage. Move to log for important data changes,

warnings.

go/topology/node_list.go

@@ -2,7 +2,7 @@ package topology
 
 import (
 	"code.google.com/p/weed-fs/go/storage"
-	"fmt"
+	"log"
 	"math/rand"
 )
 
@@ -58,7 +58,7 @@ func (nl *NodeList) RandomlyPickN(count int, minSpace int, firstNodeName string)
 		list[r], list[i-1] = list[i-1], list[r]
 	}
 	if firstNodeName != "" {
-	  list[0] = *preferredNode
+		list[0] = *preferredNode
 	}
 	return list[:count], true
 }
@@ -70,7 +70,7 @@ func (nl *NodeList) ReserveOneVolume(randomVolumeIndex int, vid storage.VolumeId
 			randomVolumeIndex -= freeSpace
 		} else {
 			if node.IsDataNode() && node.FreeSpace() > 0 {
-				fmt.Println("vid =", vid, " assigned to node =", node, ", freeSpace =", node.FreeSpace())
+				log.Println("vid =", vid, " assigned to node =", node, ", freeSpace =", node.FreeSpace())
 				return true, node.(*DataNode)
 			}
 			children := node.Children()