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https://issues.apache.org/jira/browse/HDFS-12976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16523422#comment-16523422
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Erik Krogen commented on HDFS-12976:
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Would the flag be something like {{allowObserverReads}}? I am reluctant to add
more logic specific to this feature into the {{RpcRequestHeaderProto}} since
that should be as general as possible, even more so than the
FailoverProxyProvider. But I like the direction of allowing the server to make
the ultimate decision about whether it can service the request. Maybe we could
indicate disallowing such reads via a special value (e.g. negative) for the
{{stateId}}?
> 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.WIP.patch
>
>
> {{StandbyReadProxyProvider}} should implement {{FailoverProxyProvider}}
> interface and be able to submit read requests to ANN and SBN(s).
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