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https://issues.apache.org/jira/browse/HDFS-13779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16597855#comment-16597855
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Konstantin Shvachko commented on HDFS-13779:
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Looks good, Erik. Two comments from me:
# In ORPP you use raw types: "References to generic type
AbstractNNFailoverProxyProvider<T> should be parameterized"
# Unused imports (2) in {{TestObserverReadProxyProvider}}.
# For {{CachingHAProxyFactory}} I don't think we achieve much here. It still
stores the the Proxy twice - one in the {{backingFactory}} and another in the
cache. If want to cache proxies we should do it in the RPC engine globally for
all proxies. I suggest we skip this optimization for now.
# Also {{TestObserverNode}} fails for me with your patch. I can debug if it is
only on my box.
> 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-12943.000.patch,
> HDFS-13779-HDFS-12943.001.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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