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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14162) Balancer should work with ObserverNode
Date Fri, 08 Feb 2019 23:54:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16763971#comment-16763971
] 

Erik Krogen commented on HDFS-14162:
------------------------------------

I had some discussion offline with [~shv] and he pointed me towards {{ProtocolProxy}}, which
appears to maintain some mapping of the methods implemented by the proxy.

After looking into this further, I realized that it is actually keeping track of which methods
are implemented by the _server_, rather than the proxy on the client. Actually, its methods
won't even work on HDFS proxies, because HDFS protocol interfaces do not implement {{VersionedProtocol}},
and {{ProtocolProxy}} does a cast to {{VersionedProtocol}} to fetch the server-side information.

However this pointer inspired me to make some modifications, relying more on reflection, to
greatly simplify the {{CombinedProxyBuilder}} (renamed to {{ProxyCombiner}}). [~shv], let
me know your thoughts on v001.

> 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, HDFS-14162.001.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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