From 3165b4f645b1b110abfc553a8ed6d2491a3e33e7 Mon Sep 17 00:00:00 2001
From: ieQu1 <99872536+ieQu1@users.noreply.github.com>
Date: Tue, 21 Nov 2023 18:53:34 +0100
Subject: [PATCH] fix(ds): Abort application startup when rocksdb is not
 avialable

---
 apps/emqx/src/emqx_persistent_session_ds.erl  | 6 ------
 apps/emqx_durable_storage/src/emqx_ds_sup.erl | 9 ++++++++-
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/apps/emqx/src/emqx_persistent_session_ds.erl b/apps/emqx/src/emqx_persistent_session_ds.erl
index 1e3ac69c8..928115a52 100644
--- a/apps/emqx/src/emqx_persistent_session_ds.erl
+++ b/apps/emqx/src/emqx_persistent_session_ds.erl
@@ -440,12 +440,6 @@ del_subscription(TopicFilter, DSSessionId) ->
 %%--------------------------------------------------------------------
 
 create_tables() ->
-    ok = emqx_ds:open_db(?PERSISTENT_MESSAGE_DB, #{
-        backend => builtin,
-        storage => {emqx_ds_storage_bitfield_lts, #{}},
-        n_shards => 16,
-        replication_factor => 3
-    }),
     ok = mria:create_table(
         ?SESSION_TAB,
         [
diff --git a/apps/emqx_durable_storage/src/emqx_ds_sup.erl b/apps/emqx_durable_storage/src/emqx_ds_sup.erl
index 82e2711be..081557a46 100644
--- a/apps/emqx_durable_storage/src/emqx_ds_sup.erl
+++ b/apps/emqx_durable_storage/src/emqx_ds_sup.erl
@@ -29,8 +29,15 @@ start_link() ->
 %% behaviour callbacks
 %%================================================================================
 
+-dialyzer({nowarn_function, init/1}).
 init([]) ->
-    Children = [meta(), storage_layer_sup()],
+    %% TODO: technically, we don't need rocksDB for the alternative
+    %% backends. But right now we have any:
+    Children =
+        case mria:rocksdb_backend_available() of
+            true -> [meta(), storage_layer_sup()];
+            false -> []
+        end,
     SupFlags = #{
         strategy => one_for_all,
         intensity => 0,