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https://issues.apache.org/jira/browse/HDFS-5778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910009#comment-13910009
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Fengdong Yu commented on HDFS-5778:
-----------------------------------
[~szetszwo], 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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