Tsz Wo (Nicholas), SZE created HDFS-5753:
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Summary: Add new NN startup options for downgrade and rollback
using upgrade marker
Key: HDFS-5753
URL: https://issues.apache.org/jira/browse/HDFS-5753
Project: Hadoop HDFS
Issue Type: Sub-task
Components: namenode
Reporter: Tsz Wo (Nicholas), SZE
Namenode could be started up with -upgrade / -rollback. The -rollback option
will restore the data using the previous directory. New options are needed for
downgrade and rollback using the upgrade marker.
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