J.Andreina created HDFS-8110:
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Summary: Remove unsupported operation , -rollingUpgrade downgrade
related information from document
Key: HDFS-8110
URL: https://issues.apache.org/jira/browse/HDFS-8110
Project: Hadoop HDFS
Issue Type: Bug
Reporter: J.Andreina
Assignee: J.Andreina
Priority: Minor
Support for "-rollingUpgrade downgrade" is been removed as part of HDFS-7302.
Corresponding information should be removed from document also.
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Downgrade with Downtime
Administrator may choose to first shutdown the cluster and then downgrade it.
The following are the steps:
Shutdown all NNs and DNs.
Restore the pre-upgrade release in all machines.
Start NNs with the "-rollingUpgrade downgrade" option.
Start DNs normally.
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