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New Contributor
Posts: 4
Registered: ‎06-10-2016

Cloudera Manager downgrade process(some edited)

[ Edited ]

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)
   Reports Manager
   Service Monitor
   Host Monitor
   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

New Contributor
Posts: 1
Registered: ‎01-05-2016

Re: Cloudera Manager downgrade process

Yes you should reinstall CM at 5.10.1p2223 and restore the DB's used by CM and the mangement services. [1-3]

No it's not required to also roll back CDH from 5.9 to 5.7 [4-5]

New Contributor
Posts: 4
Registered: ‎06-10-2016

Re: Cloudera Manager downgrade process

Your reply that's sound good.
But i'm afraid, scm server will be not start
Becase different scm DB's data and actually install VER.
New Contributor
Posts: 4
Registered: ‎06-10-2016

Re: Cloudera Manager downgrade process(some edited)

Your reply that's sound good.
But i'm afraid, scm server will be not start
Becase different scm DB's cdh ver data and actually install cdh VER.
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