Backup and copy from your prior version Oozie configs:

mv /etc/oozie/conf /etc/oozie/conf-backup

cp -R /etc/oozie/conf-backup/* /etc/oozie/2.3.x.y-z/0/

Create symlinks to /etc/oozie/conf:

ln -s /usr/hdp/current/oozie-client/conf /etc/oozie/conf

ls -la /etc/oozie

drwxr-xr-x. 4 root root 4096 Jul 7 14:04 . 
drwxr-xr-x. 98 root root 4096 Jul 7 11:31 .. 
drwxr-xr-x. 3 root root 4096 Jul 7 08:54 2.3.0.0-2410 
lrwxrwxrwx. 1 root root 34 Jul 7 14:04 conf -> /usr/hdp/current/oozie-client/conf 
drwxr-xr-x. 4 oozie hadoop 4096 Jul 7 02:06 conf-backup 
[root@hdpone oozie-server]# total 16

Create /usr/hdp/2.3.x.y-z/oozie/libext-upgrade23 directory.

mkdir /usr/hdp/2.3.x.y-z/oozie/libext-upgrade23

Copy the JDBC jar of your Oozie database to both

/usr/hdp/2.3.x.y-z/oozie/libext-upgrade23

and

/usr/hdp/2.3.x.y-z/oozie/libtools.

For example, if you are using MySQL,

cp /usr/hdp/<old_version>/oozie/libext/mysql-connector-java.jar /usr/hdp/2.3.x.y-z/oozie/libext-upgrade23/

cp /usr/hdp/<old_version>/oozie/libext/mysql-connector-java.jar /usr/hdp/2.3.x.y-z/oozie/libtools/

Grant read/write access to the Oozie user.

chmod -R 777 /usr/hdp/current/oozie-server/libext-upgrade23

If Falcon was also installed and configured before upgrade in HDP 2.2.x, then you need to do the following:

cp /usr/hdp/current/falcon-server/oozie/ext/falcon-oozie-el-extension-*jar /usr/hdp/current/oozie-server/libext-upgrade23/

On the Services view, make sure that YARN and MapReduce2 services are running.

Make sure that the Oozie service is stopped.

In /etc/oozie/conf/oozie-env.sh, comment out CATALINA_BASE property, also do the same using Ambari Web UI in Services > Oozie > Configs > Advanced oozie-env.

Extract share-lib.

cd /usr/hdp/current/oozie-server

tar xzvf /usr/hdp/current/oozie-server/oozie-sharelib.tar.gz

su -l <HDFS_USER> -c "hdfs dfs -mkdir -p /user/oozie"

su -l <HDFS_USER> -c "hdfs dfs -put /usr/hdp/current/oozie-server/share /user/oozie/."

You can expect warnings that some files already exist. Delete any existing /oozie/share and replace it with the newly-extracted files.

su -l <HDFS_USER> -c "hdfs dfs -chown oozie:hadoop /user/oozie"

su -l <HDFS_USER> -c "hdfs dfs -chmod -R 755 /user/oozie"

Upgrade Oozie.

su -l <OOZIE_USER> -c "/usr/hdp/current/oozie-server/bin/ooziedb.sh upgrade -run"

Prepare the Oozie WAR file.

chown <OOZIE_USER>:<HADOOP_GROUP> /usr/hdp/current/oozie-server/oozie-server/conf/server.xml

su -l <OOZIE_USER> -c "/usr/hdp/current/oozie-server/bin/oozie-setup.sh prepare-war -d /usr/hdp/current/oozie-server/libext-upgrade23"