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

    https://github.com/apache/flink/pull/5239#discussion_r168169675
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/state/DefaultOperatorStateBackend.java
 ---
    @@ -325,8 +325,7 @@ public OperatorStateHandle performOperation() throws 
Exception {
                return task;
        }
     
    -   @Override
    -   public void restore(Collection<OperatorStateHandle> restoreSnapshots) 
throws Exception {
    +   public void restore(StateObjectCollection<OperatorStateHandle> 
restoreSnapshots) throws Exception {
    --- End diff --
    
    True, it can remain `Collection`.


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