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https://issues.apache.org/jira/browse/HDFS-7849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14368639#comment-14368639
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Vinayakumar B commented on HDFS-7849:
-------------------------------------
Thanks [~andreina] for the patch.
It would looks better if the clarification looks same as in description instead
of another note.
I think following changes would do that.
{code}index 28649a8..aabf170 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml
@@ -48,6 +48,15 @@
In order to upgrade a HDFS cluster without downtime, the cluster must be
setup with HA.
</p>
<p>
+ If there is new feature which is enabled in new software release may not
work with old software release after upgrade.
+ In such cases upgrade should be done by following steps.
+ </p>
+ <ol>
+ <li>Disable new feature</li>
+ <li>upgrade the cluster</li>
+ <li>enable the new feature</li>
+ </ol>
+ <p>
Note that rolling upgrade is supported only from Hadoop-2.4.0 onwards.
</p>
<subsection name="Upgrade without Downtime" id="UpgradeWithoutDowntime">
{code}
Agree?
> 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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