Avoid returning nullptr for cp_swtichover.

HS will assume the consumer not participanting CP if nullptr returned.

Signed-off-by: Xiaoxi Chen <[email protected]>

conanfile.py

@@ -9,7 +9,7 @@
 
 class HomeObjectConan(ConanFile):
     name = "homeobject"
-    version = "2.1.18"
+    version = "2.1.19"
 
     homepage = "https://github.com/eBay/HomeObject"
     description = "Blob Store built on HomeReplication"

src/lib/homestore_backend/hs_cp_callbacks.cpp

@@ -23,7 +23,9 @@ using homestore::CPContext;
 
 namespace homeobject {
 
-std::unique_ptr< CPContext > HSHomeObject::MyCPCallbacks::on_switchover_cp(CP* cur_cp, CP* new_cp) { return nullptr; }
+std::unique_ptr< CPContext > HSHomeObject::MyCPCallbacks::on_switchover_cp(CP* cur_cp, CP* new_cp) {
+    return std::make_unique< CPContext >(new_cp);
+}
 
 // when cp_flush is called, it means that all the dirty candidates are already in the dirty list.
 // new dirty candidates will arrive on next cp's context.