HDFS data/metadata will lose when pod crash or restart.

I saw that hdfs nn/dn statefulset store hdfs data and metadata on container local dir(/root/hdfs/namenode, /root/hdfs/datanode) directly, not use k8s volume or persistvolume to persist hdfs data/metadata.
 So that HDFS data/metadata will lose when pod crash or restart, we need find a way to persist data by leverage k8s storage tech, like pv/pvc.  
 .