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https://issues.apache.org/jira/browse/HDFS-14162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16740829#comment-16740829
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Konstantin Shvachko commented on HDFS-14162:
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I attached testBalancerWithObserver-3.patch. It's a hacky way to combine two
proxies.
My idea was to define {{BalancerProtocol}} as you did. Then through reflections
find protocols it implements and use corresponding {{*PB}} implementations.
There is a finite number of those, so we can use those we know and reject
anything unknown.
Yes the idea is to avoid defining {{BalancerProtocolTranslatorPB}}.
> Balancer should work with ObserverNode
> --------------------------------------
>
> Key: HDFS-14162
> URL: https://issues.apache.org/jira/browse/HDFS-14162
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Konstantin Shvachko
> Assignee: Erik Krogen
> Priority: Major
> Attachments: HDFS-14162-HDFS-12943.wip0.patch, HDFS-14162.000.patch,
> testBalancerWithObserver-3.patch, testBalancerWithObserver.patch
>
>
> Balancer provides a substantial RPC load on NameNode. It would be good to
> divert Balancer RPCs {{getBlocks()}}, etc. to ObserverNode. The main problem
> is that Balancer uses {{NamenodeProtocol}}, while ORPP currently supports
> only {{ClientProtocol}}.
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