fix load data thread stuck in LineageCacheItemUpdater

mindinsight/backend/data_manager/__init__.py

@@ -17,7 +17,6 @@
 from mindinsight.datavisual.data_transform.data_manager import DATA_MANAGER
 from mindinsight.datavisual.common.log import logger
 from mindinsight.conf import settings
-from mindinsight.lineagemgr.cache_item_updater import LineageCacheItemUpdater
 
 
 def init_module(app):
@@ -30,6 +29,6 @@ def init_module(app):
     """
     # Just to suppress pylint warning about unused arg.
     logger.debug("App: %s", type(app))
-    DATA_MANAGER.register_brief_cache_item_updater(LineageCacheItemUpdater())
+    # Register cache item updater here, before start load data.
     DATA_MANAGER.start_load_data(reload_interval=int(settings.RELOAD_INTERVAL),
                                  max_threads_count=int(settings.MAX_THREADS_COUNT))