diff --git a/include/dsn/dist/replication/replication_app_base.h b/include/dsn/dist/replication/replication_app_base.h
index a007ce6e7e..8a4846fd1a 100644
--- a/include/dsn/dist/replication/replication_app_base.h
+++ b/include/dsn/dist/replication/replication_app_base.h
@@ -197,7 +197,8 @@ class replication_app_base : public replica_base
     // must be thread safe
     //
     virtual ::dsn::error_code copy_checkpoint_to_dir(const char *checkpoint_dir,
-                                                     /*output*/ int64_t *last_decree) = 0;
+                                                     /*output*/ int64_t *last_decree,
+                                                     bool flush_memtable = false) = 0;
 
     //
     // Query methods.
diff --git a/src/replica/split/replica_split_manager.cpp b/src/replica/split/replica_split_manager.cpp
index 463587e0e5..3a5c88d97b 100644
--- a/src/replica/split/replica_split_manager.cpp
+++ b/src/replica/split/replica_split_manager.cpp
@@ -175,7 +175,7 @@ void replica_split_manager::parent_prepare_states(const std::string &dir) // on
     learn_state parent_states;
     int64_t checkpoint_decree;
     // generate checkpoint
-    error_code ec = _replica->_app->copy_checkpoint_to_dir(dir.c_str(), &checkpoint_decree);
+    error_code ec = _replica->_app->copy_checkpoint_to_dir(dir.c_str(), &checkpoint_decree, true);
     if (ec == ERR_OK) {
         ddebug_replica("prepare checkpoint succeed: checkpoint dir = {}, checkpoint decree = {}",
                        dir,
@@ -207,8 +207,8 @@ void replica_split_manager::parent_prepare_states(const std::string &dir) // on
     plist->truncate(last_committed_decree());
 
     dcheck_eq(last_committed_decree(), checkpoint_decree);
-    dcheck_gt(mutation_list.size(), 0);
-    dcheck_gt(files.size(), 0);
+    dcheck_ge(mutation_list.size(), 0);
+    dcheck_ge(files.size(), 0);
     ddebug_replica("prepare state succeed: {} mutations, {} private log files, total file size = "
                    "{}, last_committed_decree = {}",
                    mutation_list.size(),
diff --git a/src/replica/storage/simple_kv/simple_kv.server.impl.h b/src/replica/storage/simple_kv/simple_kv.server.impl.h
index dd491dd56a..599321ec8e 100644
--- a/src/replica/storage/simple_kv/simple_kv.server.impl.h
+++ b/src/replica/storage/simple_kv/simple_kv.server.impl.h
@@ -70,7 +70,8 @@ class simple_kv_service_impl : public simple_kv_service
     virtual ::dsn::error_code async_checkpoint(bool flush_memtable) override;
 
     virtual ::dsn::error_code copy_checkpoint_to_dir(const char *checkpoint_dir,
-                                                     int64_t *last_decree) override
+                                                     int64_t *last_decree,
+                                                     bool flush_memtable = false) override
     {
         return ERR_NOT_IMPLEMENTED;
     }
diff --git a/src/replica/storage/simple_kv/test/simple_kv.server.impl.h b/src/replica/storage/simple_kv/test/simple_kv.server.impl.h
index b6fc5dda7d..86894b40ae 100644
--- a/src/replica/storage/simple_kv/test/simple_kv.server.impl.h
+++ b/src/replica/storage/simple_kv/test/simple_kv.server.impl.h
@@ -72,7 +72,8 @@ class simple_kv_service_impl : public application::simple_kv_service
     virtual ::dsn::error_code async_checkpoint(bool flush_memtable) override;
 
     virtual ::dsn::error_code copy_checkpoint_to_dir(const char *checkpoint_dir,
-                                                     int64_t *last_decree) override
+                                                     int64_t *last_decree,
+                                                     bool flush_memtable = false) override
     {
         return ERR_NOT_IMPLEMENTED;
     }
diff --git a/src/replica/test/mock_utils.h b/src/replica/test/mock_utils.h
index 66498f6bdb..9e678593cc 100644
--- a/src/replica/test/mock_utils.h
+++ b/src/replica/test/mock_utils.h
@@ -56,7 +56,8 @@ class mock_replication_app_base : public replication_app_base
         return ERR_OK;
     }
     error_code copy_checkpoint_to_dir(const char *checkpoint_dir,
-                                      /*output*/ int64_t *last_decree) override
+                                      /*output*/ int64_t *last_decree,
+                                      bool flush_memtable = false) override
     {
         if (last_decree != nullptr) {
             *last_decree = _decree;