-m 1 is the correct one (do not use -m1). But as per your code you are using -m 1 along with {{cluster_data.worker_node_hostname.length}}    remove {{cluster_data.worker_node_hostname.length}}  and try again only with -m 1   also i would recommand to practice with import instead of import-all-tables. Becuase you can customize "-m {{cluster_data.worker_node_hostname.length}}" with different size based on your file/table size (like -m 2, -m 3, etc)           ... View more