Chao Sun created HDFS-14660:
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Summary: [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
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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