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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3744) Decommissioned nodes are included in cluster after switch which is not expected
Date Wed, 01 Aug 2012 05:24:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426336#comment-13426336
] 

Brahma Reddy Battula commented on HDFS-3744:
--------------------------------------------

{quote}
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.
{quote}

But if we do client-side failover also,I think BNN will not come know.
We need to execute command on both NN's.
                
> 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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