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New Contributor
Posts: 4
Registered: ‎11-07-2017

CDH Upgrade - 'Finalize Metadata Upgrade' effect, rollback/downgrade possibilities

[ Edited ]

Hi!

 

I've just finished CDH upgrade with help of Cloudera Manager. Do you know what is the result of 'Finalize Metadata Update' NameNode's option after successful upgrade? I've used this option, but it's still enabled. How can I confirm that upgrade is finalized?

 

Provided that upgrade is not finalized yet - is there a rollback/downgrade path in case of problems with HDFS? Is it available in any configuration or only if rolling upgrade (HA and Cloudera Enterprise in place) is carried out?

 

Cloudera Employee
Posts: 2
Registered: ‎08-11-2016

Re: CDH Upgrade - 'Finalize Metadata Upgrade' effect, rollback/downgrade possibilities

Hi,

 

Most likely you have found it out by now, but an easy way is to check whether the NameNode's data directory contains the 'previous' folder in addition to the 'current' folder which is always there during normal operations.

 

Also in the newer versions Cloudera Manager gives you a warning when you are running with unfinalized metadata.

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