Konstantin Shvachko created HDFS-13779:
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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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