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https://issues.apache.org/jira/browse/HDFS-5778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910235#comment-13910235
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Vinayakumar B commented on HDFS-5778:
-------------------------------------
Hi Nicholas,
{code}
+ if (!StartupOption.isRollingUpgradeRollback(startOpt)) {
+ System.err.println("Unsupported rolling upgrade option: "
+ + startOpt.getRollingUpgradeStartupOption()
+ + " is not supported.");
+ return false;
+ }
{code}
I think in DataNode, even though downgrade option is not really required, it
should not throw exception.
Because start-dfs.sh could be used with "downgrade", in this case it will fail.
> 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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