CDH6 如果因爲其他原因，需要卸載Cloudera Manager，在各節點執行如下步驟即可。
systemctl stop cloudera-scm-server
systemctl stop cloudera-scm-agent
yum -y remove 'cloudera-manager-*'
yum clean all
umount cm_processes
umount /var/run/cloudera-scm-agent/process
rm -Rf /usr/share/cmf /var/lib/cloudera* /var/cache/yum/cloudera* /var/log/cloudera* /var/run/cloudera*
rm -rf /tmp/.scmpreparenode.lock
rm -Rf /var/lib/flume-ng /var/lib/hadoop* /var/lib/hue /var/lib/navigator /var/lib/oozie /var/lib/solr /var/lib/sqoop* /var/lib/zookeeper
rm -Rf datadrivepath/dfs datadrivepath/mapred datadrivepath/yarn
rm -rf /var/lib/hadoop-* /var/lib/impala /var/lib/solr /var/lib/zookeeper /var/lib/hue /var/lib/oozie /var/lib/pgsql /var/lib/sqoop2 /data/dfs/ /data/impala/ /data/yarn/ /dfs/ /impala/ /yarn/ /var/run/hadoop-*/ /var/run/hdfs-*/ /usr/bin/hadoop* /usr/bin/zookeeper* /usr/bin/hbase* /usr/bin/hive* /usr/bin/hdfs /usr/bin/mapred /usr/bin/yarn /usr/bin/sqoop* /usr/bin/oozie /etc/hadoop* /etc/zookeeper* /etc/hive* /etc/hue /etc/impala /etc/sqoop* /etc/oozie /etc/hbase* /etc/hcatalog
systemctl stop mariadb
yum -y remove mariadb-*
rm -rf /var/lib/mysql
rm -rf /var/log/mysqld.log
rm -rf /usr/lib64/mysql
rm -rf /usr/share/mysql
rm -rf /opt/cloudera