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https://issues.apache.org/jira/browse/HDFS-3744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427431#comment-13427431
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Aaron T. Myers commented on HDFS-3744:
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bq. Persist the NODE_DECOMMISSIONED by active so SNN will get node
DECOMMISSIONED.
I'm hesitant to go with this suggestion. How would differences be rectified
between what's persisted in the edit log and what's present in the excluded
hosts file?
bq. I would like to with your first opinion with SAFEMODE check in
replication(or move replication to Active service).
I'm afraid I don't follow this. What do safemode or replication have to do with
this issue?
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. There may be other
commands that should have similar support. For example, if an administrator
runs `hdfs dfsadmin -safemode enter' and provides a logical HA URI, should only
the active NN be put in SM? Or should both?
> 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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