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https://issues.apache.org/jira/browse/HDFS-13779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16590979#comment-16590979
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Erik Krogen commented on HDFS-13779:
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I had some offline discussion with [~shv] and we realized that the complicated
logic I use to try to be as efficient as possible about passing CFPP only
active/standby NameNodes is not really necessary. Given how infrequently
failover occurs, the few RPCs saved are not really worth the extra complexity
of the logic and intermingling between CFPP and ORPP. I will put up a new patch
with simpler logic based on Konstantin's patch for HDFS-13782.
> Implement performFailover logic for ObserverReadProxyProvider.
> --------------------------------------------------------------
>
> Key: HDFS-13779
> URL: https://issues.apache.org/jira/browse/HDFS-13779
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Reporter: Konstantin Shvachko
> Assignee: Erik Krogen
> Priority: Major
> Attachments: HDFS-13779-HDFS-12943.WIP00.patch
>
>
> Currently {{ObserverReadProxyProvider}} inherits {{performFailover()}} method
> from {{ConfiguredFailoverProxyProvider}}, which simply increments the index
> and switches over to another NameNode. The logic for ORPP should be smart
> enough to choose another observer, otherwise it can switch to a SBN, where
> reads are disallowed, or to an ANN, which defeats the purpose of reads from
> standby.
> This was discussed in HDFS-12976.
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