bdeggleston commented on code in PR #2144:
URL: https://github.com/apache/cassandra/pull/2144#discussion_r1128731964


##########
src/java/org/apache/cassandra/service/accord/AccordStateCache.java:
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@@ -149,17 +147,12 @@ public NamedMap(String name)
         }
     }
 
-    public final Map<Object, Node<?, ?>> active = new HashMap<>();
     private final Map<Object, Node<?, ?>> cache = new HashMap<>();
-    private final Map<Object, WriteOnlyGroup<?, ?>> pendingWriteOnly = new 
HashMap<>();
-    private final Set<Instance<?, ?>> instances = new HashSet<>();
+    private final Set<Instance<?, ?, ?>> instances = new HashSet<>();
 
-    private final NamedMap<Object, Future<?>> loadFutures = new 
NamedMap<>("loadFutures");
-    private final NamedMap<Object, Future<?>> saveFutures = new 
NamedMap<>("saveFutures");
-
-    private final NamedMap<Object, Future<Data>> readFutures = new 
NamedMap<>("readFutures");
-    private final NamedMap<Object, Future<?>> writeFutures = new 
NamedMap<>("writeFutures");
+    private final NamedMap<Object, AsyncResult<Void>> saveResults = new 
NamedMap<>("saveResults");
 
+    private int unreferenced = 0;
     Node<?, ?> head;

Review Comment:
   Node also has a bunch of stuff we don’t want on the cache, and I don’t like 
the idea of AccordLoadingState extending a Node type. It could be done with 
interfaces, albeit more awkwardly, but I don’t really see the benefit, aside 
from slightly simpler push/pop methods?



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