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https://issues.apache.org/jira/browse/HDFS-6004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910828#comment-13910828
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Arpit Agarwal commented on HDFS-6004:
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Hi Nicholas, when {{startRollingUpgradeInternal}} returns the rollback image
has been saved so should {{rollingUpgradeInfo#createdRollbackImages}} be
initialized to true?
> Change DFSAdmin for rolling upgrade commands
> --------------------------------------------
>
> Key: HDFS-6004
> URL: https://issues.apache.org/jira/browse/HDFS-6004
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: h6004_20140224.patch, h6004_20140224b.patch
>
>
> When rolling upgrade is initiated, a image is created for rollback. We
> propose the following changes for the DFSAdmin for rolling upgrade commands:
> - change "dfsadmin -rollingUpgrade start" to "dfsadmin -rollingUpgrade
> prepare";
> - add information for the rollback image to "dfsadmin -rollingUpgrade query".
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