From 962085c0e49a71f2ab259353639b723e41d57f0f Mon Sep 17 00:00:00 2001
From: "mergify[bot]" <37929162+mergify[bot]@users.noreply.github.com>
Date: Fri, 2 Aug 2024 17:43:33 +0000
Subject: [PATCH] v2.0: rolls out chained Merkle shreds to ~5% of testnet
 (backport of #2389) (#2407)

rolls out chained Merkle shreds to ~5% of testnet (#2389)

(cherry picked from commit a60fbc2288d626a4f1846052c8fcb98d3f9ea58d)

Co-authored-by: behzad nouri <behzadnouri@gmail.com>
---
 turbine/src/broadcast_stage/standard_broadcast_run.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/turbine/src/broadcast_stage/standard_broadcast_run.rs b/turbine/src/broadcast_stage/standard_broadcast_run.rs
index f108fc08226a6b..0ddbe1020f5f98 100644
--- a/turbine/src/broadcast_stage/standard_broadcast_run.rs
+++ b/turbine/src/broadcast_stage/standard_broadcast_run.rs
@@ -506,8 +506,14 @@ impl BroadcastRun for StandardBroadcastRun {
     }
 }
 
-fn should_chain_merkle_shreds(_slot: Slot, cluster_type: ClusterType) -> bool {
-    cluster_type == ClusterType::Development
+fn should_chain_merkle_shreds(slot: Slot, cluster_type: ClusterType) -> bool {
+    match cluster_type {
+        ClusterType::Development => true,
+        ClusterType::Devnet => false,
+        ClusterType::MainnetBeta => false,
+        // Roll out chained Merkle shreds to ~5% of testnet.
+        ClusterType::Testnet => slot % 19 == 1,
+    }
 }
 
 #[cfg(test)]