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https://issues.apache.org/jira/browse/HDFS-14660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16890722#comment-16890722
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Ayush Saxena commented on HDFS-14660:
-------------------------------------
The problem is request doesn't always goes to Observer, it was quite random,
some times to observer, some time to active. So having it verify it went to
active doesn't seems complete. As it could be held true in the previous
scenario too. So asserting the exception seems to be the verification point for
the fix.
Give a check, if you switch active off, then you can get the request served
with ObserverProxyProvider but not with other.
Will even try to spare time, to check if I could help write one to help!!!
> [SBN Read] ObserverNameNode should throw StandbyException for requests not
> from ObserverProxyProvider
> -----------------------------------------------------------------------------------------------------
>
> Key: HDFS-14660
> URL: https://issues.apache.org/jira/browse/HDFS-14660
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Chao Sun
> Assignee: Chao Sun
> Priority: Major
> Attachments: HDFS-14660.000.patch, HDFS-14660.001.patch
>
>
> In a HDFS HA cluster with consistent reads enabled (HDFS-12943), clients
> could be using either {{ObserverReadProxyProvider}},
> {{ConfiguredProxyProvider}}, or something else. Since observer is just a
> special type of SBN and we allow transitions between them, a client NOT using
> {{ObserverReadProxyProvider}} will need to have
> {{dfs.ha.namenodes.<nameservice>}} include all NameNodes in the cluster, and
> therefore, it may send request to a observer node.
> For this case, we should check whether the {{stateId}} in the incoming RPC
> header is set or not, and throw an {{StandbyException}} when it is not.
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