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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-13779) Implement performFailover logic for ObserverReadProxyProvider.
Date Wed, 01 Aug 2018 23:08:00 GMT
Konstantin Shvachko created HDFS-13779:

             Summary: 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

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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