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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