From 9b675d1fe4b117a6911722072ce3faadeddc6bce Mon Sep 17 00:00:00 2001
From: xuchang <my_byte@outlook.com>
Date: Mon, 29 Jan 2024 09:44:57 +0800
Subject: [PATCH] repair: resolve load_history shard load skew

Using uuid_xor_to_uint32 instance of table_uuid's most_significant_bits,
optimize the hash conflict to shard.
---
 repair/row_level.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/repair/row_level.cc b/repair/row_level.cc
index c443b4a4ca..cb9408e6eb 100644
--- a/repair/row_level.cc
+++ b/repair/row_level.cc
@@ -3230,7 +3230,7 @@ future<> repair_service::cleanup_history(tasks::task_id repair_id) {
 
 future<> repair_service::load_history() {
     co_await get_db().local().get_tables_metadata().parallel_for_each_table(coroutine::lambda([&] (table_id table_uuid, lw_shared_ptr<replica::table> table) -> future<> {
-        auto shard = unsigned(table_uuid.uuid().get_most_significant_bits()) % smp::count;
+        auto shard = utils::uuid_xor_to_uint32(table_uuid.uuid()) % smp::count;
         if (shard != this_shard_id()) {
             co_return;
         }