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https://issues.apache.org/jira/browse/HDFS-5778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910011#comment-13910011
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Fengdong Yu commented on HDFS-5778:
-----------------------------------

hi [~szetszwo],
please delete above comments, which is invalid format.

I read the document again,
{code}
hdfs dfsadmin -rollingUpgrade start
{code}

What steps this command indicates? 
Does that shutdown *cluster* firstly, then start HDFS with -upgrade options? or 
start to upgrade NNs and DNs one by one?

from the code patch, it only calls 
{code}
namesystem.startRollingUpgrade();
{code}


> Document new commands and parameters for improved rolling upgrades
> ------------------------------------------------------------------
>
>                 Key: HDFS-5778
>                 URL: https://issues.apache.org/jira/browse/HDFS-5778
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: documentation
>    Affects Versions: HDFS-5535 (Rolling upgrades)
>            Reporter: Akira AJISAKA
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h5778_20140220.patch, h5778_20140221.patch
>
>
> "hdfs dfsadmin -rollingUpgrade" command was newly added in HDFS-5752, and 
> some other commands and parameters will be added in the future. This issue 
> exists to flag undocumented commands and parameters when HDFS-5535 branch is 
> merging to trunk.



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