To autoselect an ID in an environment where the disks are ephemeral, LogScale can let ZooKeeper assign the ID in the case where the local filesystem does not have any data files and no cluster_membership.uuid file.

The option ZOOKEEPER_PREFIX_FOR_NODE_UUID (defaulting to /humio_autouuid_) sets the prefix to allow rack awareness by using a value that is distinct for each rack / availability zone.