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https://issues.apache.org/jira/browse/HDFS-12976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16527104#comment-16527104
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Konstantin Shvachko commented on HDFS-12976:
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Here is another variant v006, which actually passes the {{TestObserverNode}}.
[~csun] I don't think the changes in {{ConfiguredFailoverProxyProvider}} you
restored in v005 are needed anymore. The whole point was to isolate that logic
inside {{ObserverReadProxyProvider}}.
In my patch I used a very hacky approach to verify whether the node is an
Observer. See comments in the patch. This is to make it work only. We will need
to introduce a new ClientProtocol call, which checks or returns the state of
the service and does not require administration privileges. I think admin
status is not required for reading the state, similar to SafeMode, which allows
GET for anybody.
> Introduce ObserverReadProxyProvider
> -----------------------------------
>
> Key: HDFS-12976
> URL: https://issues.apache.org/jira/browse/HDFS-12976
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Reporter: Konstantin Shvachko
> Assignee: Chao Sun
> Priority: Major
> Attachments: HDFS-12976-HDFS-12943.000.patch,
> HDFS-12976-HDFS-12943.001.patch, HDFS-12976-HDFS-12943.002.patch,
> HDFS-12976-HDFS-12943.003.patch, HDFS-12976-HDFS-12943.004.patch,
> HDFS-12976-HDFS-12943.005.patch, HDFS-12976-HDFS-12943.006.patch,
> HDFS-12976.WIP.patch
>
>
> {{StandbyReadProxyProvider}} should implement {{FailoverProxyProvider}}
> interface and be able to submit read requests to ANN and SBN(s).
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