add dataCenter option when assign file keys

add dataCenter option when starting volume servers
some work related to freeze a volume. Not tested yet.

1 files changed, 13 insertions, 4 deletions

diff --git a/go/topology/configuration.go b/go/topology/configuration.go
index 4c8424214..058600a7c 100644
--- a/go/topology/configuration.go
+++ b/go/topology/configuration.go
@@ -46,11 +46,20 @@ func (c *Configuration) String() string {
 	return ""
 }
 
-func (c *Configuration) Locate(ip string) (dc string, rack string) {
-	if c != nil && c.ip2location != nil {
-		if loc, ok := c.ip2location[ip]; ok {
-			return loc.dcName, loc.rackName
+func (c *Configuration) Locate(ip string, dcName string, rackName string) (dc string, rack string) {
+	if dcName == "" {
+		if c != nil && c.ip2location != nil {
+			if loc, ok := c.ip2location[ip]; ok {
+				return loc.dcName, loc.rackName
+			}
+		}
+	} else {
+		if rackName == "" {
+			return dcName, "DefaultRack"
+		} else {
+			return dcName, rackName
 		}
 	}
+
 	return "DefaultDataCenter", "DefaultRack"
 }