Github user sunjincheng121 commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3928#discussion_r117001581
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/security/SecurityUtils.java
 ---
    @@ -230,10 +231,21 @@ private void validate() {
                }
     
                private static List<String> parseList(String value) {
    -                   if(value == null) {
    +                   if(value == null || value.isEmpty()) {
                                return Collections.emptyList();
                        }
    -                   return Arrays.asList(value.split(","));
    --- End diff --
    
    I think can we using regular expression: `return 
Arrays.asList(value.replaceAll("\\s*,\\s*", ",").split(","));`


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