diff --git a/functionsystem/src/domain_scheduler/domain_group_control/domain_group_ctrl_actor.cpp b/functionsystem/src/domain_scheduler/domain_group_control/domain_group_ctrl_actor.cpp
index a3f556fbff3223f3515e8b2a070912449d210db3..d8af1c3344a5378270681d06ec061528628f53e2 100644
--- a/functionsystem/src/domain_scheduler/domain_group_control/domain_group_ctrl_actor.cpp
+++ b/functionsystem/src/domain_scheduler/domain_group_control/domain_group_ctrl_actor.cpp
@@ -262,6 +262,11 @@ std::vector<int> DomainGroupCtrlActor::RollbackContext(const std::shared_ptr<Gro
             ctx->lastReservedInd = static_cast<int>(i);
             continue;
         }
+
+        if (i >= ctx->tryScheduleResults.size()) {
+            continue;
+        }
+
         alreadyFailed = true;
         YRLOG_INFO("{}|{}|instance({}) is already failed to reserve, rollback it context to retry", request->traceid(),
                    requestID, request->instance().instanceid());
diff --git a/functionsystem/src/function_proxy/common/observer/observer_actor.cpp b/functionsystem/src/function_proxy/common/observer/observer_actor.cpp
index 95de83514e53133b5e7d6b9597c44cc6aeabc116..b4b51fcd0f2042fdf2f945a71af84a72fade9e35 100644
--- a/functionsystem/src/function_proxy/common/observer/observer_actor.cpp
+++ b/functionsystem/src/function_proxy/common/observer/observer_actor.cpp
@@ -1104,6 +1104,12 @@ litebus::Future<SyncResult> ObserverActor::PartialInstanceInfoSyncer(const std::
             localInstance->second.set_version(1);
             PutInstance(localInstance->second, true);
         }
+
+        if (IsLowReliabilityInstance(localInstance->second)) {
+            YRLOG_WARN("failed to find low reliability instance({}) in meta-store, delete local instance",
+                       localInstance->first);
+            DelInstanceEvent(instanceID, getResponse->header.revision);
+        }
         return syncResult;
     }
     auto eventKey = TrimKeyPrefix(events.at(0).kv.key(), metaStorageAccessor_->GetMetaClient()->GetTablePrefix());