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https://issues.apache.org/jira/browse/HDFS-12975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373919#comment-16373919
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Chao Sun commented on HDFS-12975:
---------------------------------

OK, sounds good. I'll post a patch soon without the failover change. Will also 
create a separate Jira for the issue.

> Changes to the NameNode to support reads from standby
> -----------------------------------------------------
>
>                 Key: HDFS-12975
>                 URL: https://issues.apache.org/jira/browse/HDFS-12975
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Konstantin Shvachko
>            Assignee: Chao Sun
>            Priority: Major
>         Attachments: HDFS-12975.000.patch
>
>
> In order to support reads from standby NameNode needs changes to add Observer 
> role, turn off checkpointing and such.



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