Cell Dissemination (Partial messages) (#8314)

- https://github.com/ethereum/consensus-specs/pull/4558
- https://eips.ethereum.org/EIPS/eip-8136


  


Co-Authored-By: Daniel Knopik <daniel@dknopik.de>

Co-Authored-By: Pawan Dhananjay <pawandhananjay@gmail.com>

Co-Authored-By: Jimmy Chen <jchen.tc@gmail.com>

beacon_node/src/cli.rs

@@ -670,6 +670,15 @@ pub fn cli_app() -> Command {
                 .hide(true)
                 .display_order(0)
         )
+        .arg(
+            Arg::new("enable-partial-columns")
+                .long("enable-partial-columns")
+                .help("Enable partial messages for data columns. This can reduce the amount of \
+                data sent over the network.")
+                .action(ArgAction::SetTrue)
+                .help_heading(FLAG_HEADER)
+                .display_order(0)
+        )
         /*
          * Monitoring metrics
          */

beacon_node/src/config.rs

@@ -110,6 +110,21 @@ pub fn get_config<E: EthSpec>(
 
     set_network_config(&mut client_config.network, cli_args, &data_dir_ref)?;
 
+    if parse_flag(cli_args, "enable-partial-columns") {
+        // Partial messages assume that each subnet maps to exactly one column.
+        // Check this here to avoid weird issues on networks where this is not the case.
+        if spec.data_column_sidecar_subnet_count == E::number_of_columns() as u64 {
+            client_config.network.enable_partial_columns = true;
+            client_config.chain.enable_partial_columns = true;
+        } else {
+            warn!(
+                subnets = spec.data_column_sidecar_subnet_count,
+                columns = E::number_of_columns(),
+                "Not enabling partial columns on networks with multiple columns per subnet"
+            )
+        }
+    }
+
     // Parse custody mode from CLI flags
     let is_supernode = parse_flag(cli_args, "supernode");
     let is_semi_supernode = parse_flag(cli_args, "semi-supernode");