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https://issues.apache.org/jira/browse/HDFS-12975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16396408#comment-16396408
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Konstantin Shvachko commented on HDFS-12975:
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Reviewed 003 patch. Looks good. +1.
I think we should be able to transition standby to observer and back. But
active should be able to transition only to standby. At least initially, we may
"optimize" that later. Will update the design doc with this info.
> 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, HDFS-12975.001.patch,
> HDFS-12975.002.patch, HDFS-12975.003.patch
>
>
> In order to support reads from standby NameNode needs changes to add Observer
> role, turn off checkpointing and such.
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