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https://issues.apache.org/jira/browse/HDFS-13779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16598955#comment-16598955
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Erik Krogen commented on HDFS-13779:
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Good catches, Konstantin! I should have taken a closer look after my v001 ->
v002 revisions. I also removed the {{throws IOException}} clause from the
{{ObserverReadProxyProvider}} constructors, as it is no longer applicable.
Attaching v003 patch, which I also just committed to HDFS-12943 branch. Thanks
for the help [~shv] and [~vagarychen]!
> 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
> Fix For: HDFS-12943
>
> Attachments: HDFS-13779-HDFS-12943.000.patch,
> HDFS-13779-HDFS-12943.001.patch, HDFS-13779-HDFS-12943.002.patch,
> HDFS-13779-HDFS-12943.003.patch, 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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