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https://issues.apache.org/jira/browse/HDFS-14162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16944735#comment-16944735
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Erik Krogen commented on HDFS-14162:
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Backported to branch-3.2 and branch-3.1. Attaching branch-2 patch since there
were conflicts in {{NameNodeProxies}} -- the main thing was that in
branch-3.1+, the RPC timeout is specified separately by each proxy type,
whereas in branch-2 the default RPC timeout is used for all of them.
Additionally, the new interface method on {{HAProxyFactory}} couldn't be marked
{{default}} since that's a Java 8 feature. No class was making use of the
default. [~shv], can you help review the branch-2 backport?
> 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
> Fix For: 3.3.0, 3.1.4, 3.2.2
>
> Attachments: HDFS-14162-HDFS-12943.wip0.patch,
> HDFS-14162-branch-2.004.patch, HDFS-14162.000.patch, HDFS-14162.001.patch,
> HDFS-14162.002.patch, HDFS-14162.003.patch, HDFS-14162.004.patch,
> ReflectionBenchmark.java, 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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