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https://issues.apache.org/jira/browse/HDFS-5584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee resolved HDFS-5584.
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    Resolution: Later

> Add OOB upgrade response and client-side logic for reads
> --------------------------------------------------------
>
>                 Key: HDFS-5584
>                 URL: https://issues.apache.org/jira/browse/HDFS-5584
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, ha, hdfs-client, namenode
>            Reporter: Kihwal Lee
>
> Similarly to HDFS-5583, readers can also benefit from the knowledge that a 
> data node failure is caused by an upgrade restart.  Instead of permanently 
> removing from the potential data source for the client, it could retry the 
> node more times before declaring it dead.



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