In order to cleanup kylin metadata, HBase tables and HDFS. Can I do this while kylin cube jobs are running in the background. Is there a chance that the metadata might get messed up? In this document http://kylin.apache.org/docs15/howto/howto_cleanup_storage.html it says you can do offline cleanup. What is offline in this context does it mean I have to stop the build jobs ? Similarly with this http://kylin.apache.org/docs15/howto/howto_backup_metadata.html. Is it safe to run this while build jobs are running ?