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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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