belliottsmith commented on code in PR #4202:
URL: https://github.com/apache/cassandra/pull/4202#discussion_r2184907125
##########
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;
+ ImmutableUniqueList<TokenRange> ranges;
+ {
+ ImmutableUniqueList.Builder<TableId> tablesBuilder =
ImmutableUniqueList.builder();
+ ImmutableUniqueList.Builder<TokenRange> rangesBuilder =
ImmutableUniqueList.builder();
+ for (Shard shard : shards)
+ {
+ TokenRange range = (TokenRange) shard.range;
+ tablesBuilder.add(range.table());
+ rangesBuilder.add(range.withTable(TableId.UNDEFINED));
+ }
+ tables = tablesBuilder.buildAndClear();
+ ranges = rangesBuilder.buildAndClear();
+ }
+
+ CollectionSerializers.serializeList(tables, out,
TableId.compactComparableSerializer);
+ CollectionSerializers.serializeList(ranges, out,
TokenRange.noTableSerializer);
+
+ out.writeUnsignedVInt32(shards.size());
+ for (Shard shard : shards)
+ {
+ TokenRange range = (TokenRange) shard.range;
+ int tableIdx = tables.indexOf(range.table());
+ int rangeIdx =
ranges.indexOf(range.withTable(TableId.UNDEFINED));
+ out.writeUnsignedVInt32(tableIdx);
+ out.writeUnsignedVInt32(rangeIdx);
+
+ CollectionSerializers.serializeList(shard.nodes, out,
TopologySerializers.nodeId);
+ BitSet notInFastPath = SortedArrays.toBitSet(shard.nodes,
shard.notInFastPath);
+ BitSetSerializer.instance.serialize(notInFastPath, out);
Review Comment:
If we use accord's `SimpleBitSet` we can de/serialize without allocating a
new byte[]
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