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From "Vinay (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3744) Decommissioned nodes are included in cluster after switch which is not expected
Date Thu, 05 Sep 2013 09:01:02 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3744?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinay updated HDFS-3744:
------------------------

    Attachment: HDFS-3744.patch

{quote}I think my preference here is to require the admin to keep the excluded hosts files
in sync across the machines (most deployments already have some way of keeping config files
in sync), and then just make dfsadmin iterate over all configured NNs when the refreshNodes
command is run.{quote}
Attaching a patch which this change. Please review.
                
> 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, 2.0.1-alpha
>            Reporter: Brahma Reddy Battula
>         Attachments: HDFS-3744.patch
>
>
> 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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