From a0d7e2643dd2ba01cb2afe6ff6647f9cee667958 Mon Sep 17 00:00:00 2001
From: "mergify[bot]" <37929162+mergify[bot]@users.noreply.github.com>
Date: Tue, 17 Dec 2024 22:43:25 +0000
Subject: [PATCH] v2.0: rolls out chained Merkle shreds to ~5% of mainnet slots
 (backport of #4019) (#4130)

rolls out chained Merkle shreds to ~5% of mainnet slots (#4019)

(cherry picked from commit d3fe8f8a01725e02c9ca594ffe8b1461f10b0e9a)

Co-authored-by: behzad nouri <behzadnouri@gmail.com>
---
 turbine/src/broadcast_stage/standard_broadcast_run.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/turbine/src/broadcast_stage/standard_broadcast_run.rs b/turbine/src/broadcast_stage/standard_broadcast_run.rs
index 22e000e2af0092..6ef11ff3cc408c 100644
--- a/turbine/src/broadcast_stage/standard_broadcast_run.rs
+++ b/turbine/src/broadcast_stage/standard_broadcast_run.rs
@@ -506,11 +506,12 @@ impl BroadcastRun for StandardBroadcastRun {
     }
 }
 
-fn should_chain_merkle_shreds(_slot: Slot, cluster_type: ClusterType) -> bool {
+fn should_chain_merkle_shreds(slot: Slot, cluster_type: ClusterType) -> bool {
     match cluster_type {
         ClusterType::Development => true,
         ClusterType::Devnet => true,
-        ClusterType::MainnetBeta => false,
+        // Roll out chained Merkle shreds to ~5% of mainnet slots.
+        ClusterType::MainnetBeta => slot % 19 == 1,
         ClusterType::Testnet => true,
     }
 }