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Date: Tue, 31 Jul 2012 21:42:34 +0000 (UTC)
From: "Aaron T. Myers (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <996566.123929.1343770954790.JavaMail.jiratomcat@issues-vm>
Subject: [jira] [Commented] (HDFS-3744) Decommissioned nodes are included in
 cluster after switch which is not expected
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    [ https://issues.apache.org/jira/browse/HDFS-3744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426154#comment-13426154 ] 

Aaron T. Myers commented on HDFS-3744:
--------------------------------------

Brahma, in the above description, I assume that you excluded DN1 by adding it to the excludes file? Did you add it to that file on both of the NN machines?

The issue is that some dsfadmin commands need to perform client-side failover and talk to the appropriate NN, while others should actually be run against both NNs.
                
> Decommissioned nodes are included in cluster after switch which is not expected
> -------------------------------------------------------------------------------
>
>                 Key: HDFS-3744
>                 URL: https://issues.apache.org/jira/browse/HDFS-3744
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 2.0.0-alpha, 2.1.0-alpha, 2.0.1-alpha
>            Reporter: Brahma Reddy Battula
>
> Scenario:
> =========
> Start ANN and SNN with three DN's
> Exclude DN1 from cluster by using decommission feature 
> (./hdfs dfsadmin -fs hdfs://ANNIP:8020 -refreshNodes)
> After decommission successful,do switch such that SNN will become Active.
> Here exclude node(DN1) is included in cluster.Able to write files to excluded node since it's not excluded.
> Checked SNN(Which Active before switch) UI decommissioned=1 and ANN UI 
> decommissioned=0
> One more Observation:
> ====================
> All dfsadmin commands will create proxy only on nn1 irrespective of Active or standby.I think this also we need to re-look once..
> I am not getting , why we are not given HA for dfsadmin commands..?
> Please correct me,,If I am wrong.

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