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Once you change the ConcurrentMap to a ConsistentMap, we will need to update the way the map is created in the activate() method. Here is how we can ask the storage service for a ConcurrentMap:

Code Block
	 /**
      * TODO Lab 5: Replace the ConcurrentHashMap with ConsistentMap
      *
      * You should use storageService.consistentMapBuilder(), and the
      * serializer: Serializer.using(KryoNamespaces.API)
      */
      nets = storageService.<String, Set<HostId>>consistentMapBuilder()
                .withSerializer(Serializer.using(KryoNamespaces.API))
                .withName("byon-networks")
                .build();

      networks = nets.asJavaMap();

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