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From "Uma Maheswara Rao G (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 05:32:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426339#comment-13426339
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Uma Maheswara Rao G commented on HDFS-3744:
-------------------------------------------

{quote}other option might be like we have to perform refresh nodes on switch.{quote}
one problem here is, if we just configure excludes and not executed refreshNodes command yet
and just switch happend then this may perform refereshNodes simply. So, This may not be the
preferable way to go.

We can think about the other option in the above comment.
                
> 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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