I became a hadoop ops two months ago. I want ask a basic question. please help me.
I am using hadoop-2.3cdh5.0.2. use yarn and build ha for hdfs.
in ha case, do we need backup namenode metadata? main fsimage?
use hdfs dfsadmin -fetchImage <local directory>?
if namenode(active and standby fsimage are both bad), how we use backup fsimage?
just copy the file to active namenode coresponding folder?