Fix show create table hang when global service is not leader

src/share/ob_global_autoinc_service.cpp

@@ -258,9 +258,6 @@ int ObGlobalAutoIncService::handle_curr_autoinc_request(const ObGAISAutoIncKeyAr
     LOG_WARN("invalid argument", K(ret), K(request));
   } else if (OB_FAIL(check_leader_(key.tenant_id_, is_leader))) {
     LOG_WARN("check leader failed", K(ret), K(request.sender_), K(self_));
-  } else if (OB_UNLIKELY(!is_leader)) {
-    ret = OB_NOT_MASTER;
-    LOG_WARN("gais service is not leader", K(ret));
   } else if (OB_FAIL(mutex.lock())) {
     LOG_WARN("fail to get lock", K(ret));
   } else {
@@ -270,11 +267,12 @@ int ObGlobalAutoIncService::handle_curr_autoinc_request(const ObGAISAutoIncKeyAr
     if (OB_UNLIKELY(OB_SUCCESS != err && OB_HASH_NOT_EXIST != err)) {
       ret = OB_ERR_UNEXPECTED;
       LOG_WARN("failed to get seq value", K(ret), K(key));
-    } else if (OB_LIKELY(cache_node.is_valid())) {
+    } else if (is_leader && OB_LIKELY(cache_node.is_valid())) {
       // get autoinc values from cache
       sequence_value = cache_node.sequence_value_;
       sync_value = cache_node.sync_value_;
-      // hash not exist or cache node is non-valid, read value from inner table
+      // hash not exist, cache node is non-valid or service is not leader,
+      // read value from inner table
     } else if (OB_FAIL(read_value_from_inner_table_(key, sequence_value, sync_value))) {
       LOG_WARN("fail to read value from inner table", K(ret));
     }