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https://issues.apache.org/jira/browse/HDFS-7849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14362741#comment-14362741
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J.Andreina commented on HDFS-7849:
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Failures are not related to this patch .
> 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: J.Andreina
> Priority: Minor
> Attachments: HDFS-7849.1.patch
>
>
> 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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