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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9112) Haadmin fails if multiple name service IDs are configured
Date Mon, 21 Sep 2015 23:19:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14901600#comment-14901600
] 

Anu Engineer commented on HDFS-9112:
------------------------------------

[~jingzhao] Thanks for the pointer to the [~dlmarion] 's comments. I see that we had assumed
that it is better to let users specify -ns option if they have this kind of HA setup. However
it looks like both us and cloudera ran into this issue in the field hence I think we need
to have a little more clarity with error messages, with the current code the error message
is very cryptic.
{code}
hdfs haadmin -getServiceState nn2
Illegal argument: Unable to determine the nameservice id.
{code}
This gives no clue to the user that they are expected to specify -ns option. Also from the
comments that you pointed me to I am not able to decipher why it is better to specify "-ns"
by the user, when we have that information in the config files. Since I don't have much context
on HDFS-6376, I would appreciate if you can provide some rationale (From cursory comment reading
it looks to me that Dave originally had exclude settings which created some issues, but [~wheat9]
 modified them to internal nameservices. If so using internal name services hopefully should
not cause a failure.)

if you like I can modify this patch to print out an error message which asks user to add -ns
option explicitly, instead of reading the name services name from config, that would be a
trivial change. Please let me know if you think I should do that or if this change looks good
enough.
 


> Haadmin fails if multiple name service IDs are configured
> ---------------------------------------------------------
>
>                 Key: HDFS-9112
>                 URL: https://issues.apache.org/jira/browse/HDFS-9112
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: tools
>    Affects Versions: 2.7.1
>            Reporter: Anu Engineer
>            Assignee: Anu Engineer
>         Attachments: HDFS-9112.001.patch
>
>
> In HDFS-6376 we supported a feature for distcp that allows multiple NameService IDs to
be specified so that we can copy from two HA enabled clusters.
> That confuses haadmin command since we have a check in DFSUtil#getNamenodeServiceAddr
which fails if it finds more than 1 name in that property.



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