Tsz Wo Nicholas Sze created HDFS-7849:
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Summary: Update documentation for enabling a new feature in
rolling upgrade
Key: HDFS-7849
URL: https://issues.apache.org/jira/browse/HDFS-7849
Project: Hadoop HDFS
Issue Type: Improvement
Components: documentation
Reporter: Tsz Wo Nicholas Sze
Assignee: Tsz Wo Nicholas Sze
Priority: Minor
When there is a new feature in a new software, the new feature may not work
correctly with the old software. In such case, rolling upgrade should be done
by the following steps:
# disable the new feature,
# upgrade the cluster, and
# enable the new feature.
We should clarify it in the documentation.
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