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

    https://github.com/apache/storm/pull/1798#discussion_r90406042
  
    --- Diff: storm-core/src/jvm/org/apache/storm/state/KeyValueState.java ---
    @@ -45,4 +47,9 @@
          * @return the value or defaultValue if no mapping is found
          */
         V get(K key, V defaultValue);
    +
    +    /**
    +     * @return all key value mappings as an unmodifiable map.
    +     */
    +    Map<K, V> getAll();
    --- End diff --
    
    At a high level I think you should be able to use redis hscan to implement 
the iterator and deserialize the key/values as you return them. 


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