05-19-2017 07:30 PM
I upgraded CM 5.8.3, CDH 5.7.5 to CM 5.11.0, CDH 5.9.1 in our cluster
Then I applied the Sentry and spark 2.0 version.
So HDFS data not added but HDFS permmision and owner changed
Anyway, I had to install CM version 5.10.1, but I found myself installing a version of CM version 5.11.0.
Though there is no problem with the our cluster,
my manager wants to reinstall the CM 5.10.1 in our cluster
because it has different another cluster
So I have a question about downgrade.
I'd like to know if CM downgrade is possible with below command :
yum downgrade cloudera-manager-agent , cloudera-manager-daemons, cloudera-manager-server
If it is impossible, please confirm if the following process is correct.
I hope to downgrade only CM 5.11.1 to CM 5.11.0
1. yum remove CM 5.11.0
2. yum install CM 5.8.5(because metadata backup vesion is 5.8.3)
3. Restore the following Cloudera Manager databases:
Cloudera Manager Server
Activity Monitor (depending on your deployment, this role may not be installed)
Navigator Audit Server
Navigator Metadata Server
I am worried that CM will not start because the cdh version stored in the scm metastore
does not match the actual installed version of CDH.
so below process(5~6 and 8) likely to be needed.
is it right ?
5. restore HDFS Metastore(fsimage, editslog) in active namenode
6. CDH 5.9.1 deactivate and CDH 5.7.5 activate
7. yum update CM 5.10.1
8. CDH 5.7.5 deactivate and CDH 5.9.1 activate
please advise to me