From 7287fbe68e50917702b5ed83a916181c5e26d6c4 Mon Sep 17 00:00:00 2001
From: Eugene Dobry <eugene@dobry.me>
Date: Mon, 17 Mar 2025 16:58:16 -0400
Subject: [PATCH] only first participant is sequencer

---
 src/el_cl_launcher.star | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/src/el_cl_launcher.star b/src/el_cl_launcher.star
index dc23d38a..469bf198 100644
--- a/src/el_cl_launcher.star
+++ b/src/el_cl_launcher.star
@@ -154,6 +154,7 @@ def launch(
     all_cl_contexts = []
     all_el_contexts = []
     sequencer_enabled = True
+    sequencer_context = None
     rollup_boost_enabled = "rollup-boost" in additional_services
     external_builder = mev_params.builder_host != "" and mev_params.builder_port != ""
 
@@ -249,7 +250,6 @@ def launch(
             index_str, l2_services_suffix
         )
 
-        sequencer_context = all_el_contexts[0] if len(all_el_contexts) > 0 else None
         el_context = el_launch_method(
             plan,
             el_launcher,
@@ -266,9 +266,9 @@ def launch(
             interop_params,
         )
 
-        # We need to make sure that el_context and cl_context are first in the list, as down the line all_el_contexts[0]
-        # and all_cl_contexts[0] are used
-        all_el_contexts.insert(0, el_context)
+        all_el_contexts.append(el_context)
+        if sequencer_enabled:
+            sequencer_context = el_context
 
         for metrics_info in [x for x in el_context.el_metrics_info if x != None]:
             observability.register_node_metrics_job(
@@ -361,9 +361,7 @@ def launch(
             da_server_context,
         )
 
-        # We need to make sure that el_context and cl_context are first in the list, as down the line all_el_contexts[0]
-        # and all_cl_contexts[0] are used
-        all_cl_contexts.insert(0, cl_context)
+        all_cl_contexts.append(cl_context)
 
         for metrics_info in [x for x in cl_context.cl_nodes_metrics_info if x != None]:
             observability.register_node_metrics_job(
@@ -411,5 +409,9 @@ def launch(
                 )
             all_cl_contexts.append(cl_builder_context)
 
+        # only the first participant is the sequencer
+        if sequencer_enabled:
+            sequencer_enabled = False
+
     plan.print("Successfully added {0} EL/CL participants".format(num_participants))
     return all_el_contexts, all_cl_contexts