weizhouapache commented on a change in pull request #5319:
URL: https://github.com/apache/cloudstack/pull/5319#discussion_r691870276



##########
File path: systemvm/debian/opt/cloud/bin/cs/CsDhcp.py
##########
@@ -58,17 +58,11 @@ def process(self):
         if self.conf.commit():
             restart_dnsmasq = True
 
-        if self.cloud.commit():
-            restart_dnsmasq = True
-
-        if self.dhcp_leases.commit():
-            restart_dnsmasq = True
-
+        self.dhcp_hosts.commit()
+        self.dhcp_leases.commit()
         self.dhcp_opts.commit()
 
-        if restart_dnsmasq:
-            self.delete_leases()
-
+        self.delete_leases()
         self.write_hosts()

Review comment:
       @rhtyd 
   the method delete_leases was mainly introduced by #3351, which is used to 
remove entries from dnsmasq.leases file for VMs which have  been removed (no 
impact on all existing vms).
   
   in my opinion, it will not cause any regression. the only issue I see is 
that execution time will be increased few milliseconds if stop/start a 
vm(currently delete_leases is not triggered).
    
https://github.com/apache/cloudstack/blob/737f50d133c918f1f61580c1c23ebf37b12a3799/systemvm/debian/opt/cloud/bin/cs/CsDhcp.py#L134-L154




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