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https://issues.apache.org/jira/browse/HADOOP-2992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12578412#action_12578412
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Raghu Angadi commented on HADOOP-2992:
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+1.
> Sequential distributed upgrades.
> --------------------------------
>
> Key: HADOOP-2992
> URL: https://issues.apache.org/jira/browse/HADOOP-2992
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs, test
> Affects Versions: 0.14.0
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Fix For: 0.17.0
>
> Attachments: DistrUpgrade.patch
>
>
> The distributed upgrades were tested in the case of one distributed upgrade
> only.
> It turned out to be that current implementation of the framework does not
> support multiple upgrades.
> This feature is needed for the appends. See HADOOP-2656.
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