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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5122) WebHDFS should support logical service names in URIs
Date Tue, 10 Sep 2013 23:43:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13763721#comment-13763721
] 

Jing Zhao commented on HDFS-5122:
---------------------------------

bq. to handle the possibility that the first namenode isn't the currently active one

I think that's what Haohui's comment "Putting the work of automatically switching to" means
here. So we may have some bad scenarios such as 1) the first listed namenode is not active
right now, and 2) the NN failover is happening thus the previous active NN becomes standby,
and 3) the active NN keeps changing in a short period of time.. Thus what we need here is
the same logic with RetryInvocationHandler. 
                
> WebHDFS should support logical service names in URIs
> ----------------------------------------------------
>
>                 Key: HDFS-5122
>                 URL: https://issues.apache.org/jira/browse/HDFS-5122
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha, webhdfs
>    Affects Versions: 2.1.0-beta
>            Reporter: Arpit Gupta
>            Assignee: Haohui Mai
>         Attachments: HDFS-5122.patch
>
>
> For example if the dfs.nameservices is set to arpit
> {code}
> hdfs dfs -ls webhdfs://arpit:50070/tmp
> or 
> hdfs dfs -ls webhdfs://arpit/tmp
> {code}
> does not work
> You have to provide the exact active namenode hostname. On an HA cluster using dfs client
one should not need to provide the active nn hostname

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