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https://issues.apache.org/jira/browse/HDFS-14660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16889832#comment-16889832
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Chao Sun edited comment on HDFS-14660 at 7/21/19 10:08 PM:
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{quote}For the special value we may raise separate JIRA.(Just we should ensure
it gets done too.)
{quote}
[~ayushtkn]: could you clarify a little bit on this use case? is the purpose to
let client read stale data from observer?
If so, you can already achieve this with {{msync}}, no? just don't do {{msync}}
from client side.
was (Author: csun):
{quote}*For the special value we may raise separate JIRA.(Just we should ensure
it gets done too.)
{quote}
[~ayushtkn]: could you clarify a little bit on this use case? is the purpose to
let client read stale data from observer?
If so, you can already achieve this with {{msync}}, no? just don't do {{msync}}
from client side.
> [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
>
>
> 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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