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https://issues.apache.org/jira/browse/HDFS-7849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14362732#comment-14362732
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Hadoop QA commented on HDFS-7849:
---------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12704358/HDFS-7849.1.patch
against trunk revision 3ff1ba2.
{color:red}-1 patch{color}. Trunk compilation may be broken.
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/9889//console
This message is automatically generated.
> 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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