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https://issues.apache.org/jira/browse/HDFS-1623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13208599#comment-13208599
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dhruba borthakur commented on HDFS-1623:
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> I think for the first cut we should disallow the NN to start with HA enabled
> if the upgrade flag is passed, or if there is a pending unfinalized upgrade.
sounds like a fine thing to do, in the interest of making HA be part of apache
hdfs trunk sooner rather than later.
> High Availability Framework for HDFS NN
> ---------------------------------------
>
> Key: HDFS-1623
> URL: https://issues.apache.org/jira/browse/HDFS-1623
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Sanjay Radia
> Assignee: Sanjay Radia
> Attachments: HA-tests.pdf, HDFS-High-Availability.pdf, NameNode
> HA_v2.pdf, NameNode HA_v2_1.pdf, Namenode HA Framework.pdf, ha-testplan.pdf,
> ha-testplan.tex
>
>
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