belliottsmith commented on code in PR #4202:
URL: https://github.com/apache/cassandra/pull/4202#discussion_r2192756702
##########
src/java/org/apache/cassandra/service/accord/serializers/TopologySerializers.java:
##########
@@ -159,4 +167,127 @@ public long serializedSize(Topology topology)
return size;
}
};
+
+ public static final UnversionedSerializer<Topology> compactTopology = new
UnversionedSerializer<>()
+ {
+ @Override
+ public void serialize(Topology topology, DataOutputPlus out) throws
IOException
+ {
+ out.writeLong(topology.epoch());
+ CollectionSerializers.serializeList(topology.staleIds(), out,
TopologySerializers.nodeId);
+
+ List<Shard> shards = topology.shards();
+
+ // need to loop twice; once to collect tables/ranges, and another
to save shards
+ ImmutableUniqueList<TableId> tables;
Review Comment:
In fact, you can even do this dynamically - which is another common
technique in our serializers. When you go to deserialise a value, you first
deserialize the index, and if the index is some sentinel (e.g. 0), then you
deserialize the value and insert it into the List; otherwise you lookup the
relevant index that has already been deserialised. On serialization, when you
lookup the index, if it isn't there you write the sentinel and then the value.
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