The upgrade is now fully functional but not yet finalized. Using the
finalize command removes the previous version of the NameNode and
DataNode storage directories. After the upgrade is finalized, the
system cannot be rolled back. Perform thorough testing of the upgraded
cluster before finalizing the upgrade. The upgrade must be finalized before another
upgrade can be performed.
Directories used by Hadoop 1 services set in
/etc/hadoop/conf/taskcontroller.cfg are not automatically deleted
after upgrade. Administrators can choose to delete these directories after the upgrade.
To finalize the upgrade, execute the following command once, on the primary NameNode host in your HDP cluster:
sudo su -l <HDFS_USER> -c "hdfs dfsadmin
-finalizeUpgrade"
where <HDFS_USER> is the HDFS service user. For example, hdfs.
