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https://issues.apache.org/jira/browse/HDFS-2569?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J resolved HDFS-2569.
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Resolution: Cannot Reproduce
Assignee: (was: Harsh J)
Cannot quite reproduce this on current versions.
> DN decommissioning quirks
> -------------------------
>
> Key: HDFS-2569
> URL: https://issues.apache.org/jira/browse/HDFS-2569
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 0.23.0
> Reporter: Harsh J
>
> Decommissioning a node is working slightly odd in 0.23+:
> The steps I did:
> - Start HDFS via {{hdfs namenode}} and {{hdfs datanode}}. 1-node cluster.
> - Zero files/blocks, so I go ahead and exclude-add my DN and do {{hdfs
> dfsadmin -refreshNodes}}
> - I see the following log in NN tails, which is fine:
> {code}
> 11/11/20 09:28:10 INFO util.HostsFileReader: Setting the includes file to
> 11/11/20 09:28:10 INFO util.HostsFileReader: Setting the excludes file to
> build/test/excludes
> 11/11/20 09:28:10 INFO util.HostsFileReader: Refreshing hosts
> (include/exclude) list
> 11/11/20 09:28:10 INFO util.HostsFileReader: Adding 192.168.1.23 to the list
> of hosts from build/test/excludes
> {code}
> - However, DN log tail gets no new messages. DN still runs.
> - The dfshealth.jsp page shows this table, which makes no sense -- why is
> there 1 live and 1 dead?:
> |Live Nodes|1 (Decommissioned: 1)|
> |Dead Nodes|1 (Decommissioned: 0)|
> |Decommissioning Nodes|0|
> - The live nodes page shows this, meaning DN is still up and heartbeating but
> is decommissioned:
> |Node|Last Contact|Admin State|
> |192.168.1.23|0|Decommissioned|
> - The dead nodes page shows this, and the link to the DN is broken cause the
> port is linked as -1. Also, showing 'false' for decommissioned makes no sense
> when live node page shows that it is already decommissioned:
> |Node|Decommissioned|
> |192.168.1.23|false|
> Investigating if this is a quirk only observed when the DN had 0 blocks on it
> in sum total.
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