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https://issues.apache.org/jira/browse/HDFS-14979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16973625#comment-16973625
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Konstantin Shvachko commented on HDFS-14979:
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+1 LGTM
> [Observer Node] Balancer should submit getBlocks to Observer Node when
> possible
> -------------------------------------------------------------------------------
>
> Key: HDFS-14979
> URL: https://issues.apache.org/jira/browse/HDFS-14979
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: balancer & mover, hdfs
> Reporter: Erik Krogen
> Assignee: Erik Krogen
> Priority: Major
> Attachments: HDFS-14979.000.patch
>
>
> In HDFS-14162, we made it so that the Balancer could function when
> {{ObserverReadProxyProvider}} was in use. However, the Balancer would still
> read from the active NameNode, because {{getBlocks}} wasn't annotated as
> {{@ReadOnly}}. This task is to enable the Balancer to actually read from the
> Observer Node to alleviate load from the active NameNode.
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