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https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15398345#comment-15398345
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Jiayi Zhou commented on HDFS-10702:
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This JIRA gives us a more up-to-date data on Standby NN.
> Add a Client API and Proxy Provider to enable stale read from Standby
> ---------------------------------------------------------------------
>
> Key: HDFS-10702
> URL: https://issues.apache.org/jira/browse/HDFS-10702
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Jiayi Zhou
> Assignee: Jiayi Zhou
> Priority: Minor
>
> Currently, clients must always talk to the active NameNode when performing
> any metadata operation, which means active NameNode could be a bottleneck for
> scalability. One way to solve this problem is to send read-only operations to
> Standby NameNode. The disadvantage is that it might be a stale read.
> Here, I'm thinking of adding a Client API to enable/disable stale read from
> Standby which gives Client the power to set the staleness restriction.
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