Github user jburwell commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1470#discussion_r59294795
  
    --- Diff: 
core/src/com/cloud/agent/resource/virtualnetwork/facade/AbstractConfigItemFacade.java
 ---
    @@ -104,13 +109,25 @@ public static AbstractConfigItemFacade 
getInstance(final Class<? extends Network
             return instance;
         }
     
    +
    +    private static String appendUuidToJsonFiles(final String filename) {
    +        String remoteFileName = new String(filename);
    +        if (remoteFileName.endsWith("json")) {
    +            remoteFileName += "." + UUID.randomUUID().toString();
    +        }
    +        return remoteFileName;
    +    }
    +
         protected List<ConfigItem> generateConfigItems(final ConfigBase 
configuration) {
             final List<ConfigItem> cfg = new LinkedList<>();
     
    -        final ConfigItem configFile = new 
FileConfigItem(VRScripts.CONFIG_PERSIST_LOCATION, destinationFile, 
gson.toJson(configuration));
    +        final String remoteFilename = 
appendUuidToJsonFiles(destinationFile);
    +        s_logger.debug("Transformed filename " + destinationFile + " to " 
+ remoteFilename);
    --- End diff --
    
    Please wrap in a ``if (s_logger.isDebugEnabled())`` block to avoid 
unnecessary string creation due to pre-method string concatenation when 
``DEBUG`` is not enabled.


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