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From "Chao Sun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14660) [SBN Read] ObserverNameNode should throw StandbyException for requests not from ObserverProxyProvider
Date Fri, 26 Jul 2019 06:03:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16893349#comment-16893349
] 

Chao Sun commented on HDFS-14660:
---------------------------------

[~ayushtkn] I updated the test case by testing the {{StandbyException}}. Can you take another
look? Thanks. 

> [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, HDFS-14660.002.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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