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https://issues.apache.org/jira/browse/HDFS-14660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16888931#comment-16888931
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Erik Krogen commented on HDFS-14660:
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{quote}
In this case we just need to check whether the stateId is set or not (via
RpcHeaderProtos#hasStateId which checks a special field).
{quote}
+1 to this [~csun], this seems like the cleanest way to check if it has been
set. I forgot that protobuf provides this for us.
> [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
>
> 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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