Upgrade Cloudera Manager and CDH to 5.2.1

Upgrade Cloudera Manager to 5.2.1

1. Stop the Cloudera Management Service
2. Stop the Hive service and all services such as Impala and Hue that use the Hive metastore.
3. Backup MySQL Databases (mysqldump -q -uroot -p --single-transaction --flush-logs --master-data=2 --delete-master-logs --all-databases > backup.sql)

4. service cloudera-scm-server stop; service cloudera-scm-agent stop

5. (optional) yum -y install oracle-j2sdk1.7
rm -rf /usr/java/default
ln -s  /usr/java/jdk1.7.0_67-cloudera /usr/java/default

6. yum clean all; yum -y upgrade cloudera-manager-daemons cloudera-manager-server cloudera-manager-agent
service cloudera-scm-server start

7. login Cloudera Manager Web UI

8. Start the Cloudera Management Service

Upgrade CDH to 5.2.1

1. Before You Begin
Run sudo -u hdfs hdfs fsck / and sudo -u hdfs hdfs dfsadmin -report and fix any issues
Run sudo -u hbase hbase hbck to make sure there are no inconsistencies

2. stop cluster and cloudera management service

3. Back up the HDFS Metadata on the NameNode (including active and standby namenode)

tar -zcvf /root/nn_backup_data.tar.gz /dfs/nn

4. Download, Distribute, and Activate Parcels

5. start cloudera management service

6. finish following steps

7. remove old parcels

ok