[jira] [Work started] (HDFS-13779) Implement performFailover logic for ObserverReadProxyProvider.

["Erik Krogen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-13779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HDFS-13779 started by Erik Krogen.
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> 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
>
> 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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