The returned map from the node seems to be an instance of 
java.util.Collections$UnmodifiableMap. The javadoc for the UnmodifiableMap 
specifies:

anonymous wrote : unmodifiableMap
  | 
  | public static <K,V> Map<K,V> unmodifiableMap(Map<? extends K,? extends V> m)
  | 
  |     Returns an unmodifiable view of the specified map. This method allows 
modules to provide users with "read-only" access to internal maps. Query 
operations on the returned map "read through" to the specified map, and 
attempts to modify the returned map, whether direct or via its collection 
views, result in an UnsupportedOperationException.
  | 
  |     The returned map will be serializable if the specified map is 
serializable.
  | 
  |     Parameters:
  |         m - the map for which an unmodifiable view is to be returned. 
  |     Returns:
  |         an unmodifiable view of the specified map.

I would say it is plausible that the unmodifiedMap provides an immutable view 
but is still backed by a map which will reflect changes to the underlying data 
thus creating a map which is not safe to iterate in concurrent situations. 


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