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https://issues.apache.org/jira/browse/HDFS-8950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinod Kumar Vavilapalli updated HDFS-8950:
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Fix Version/s: (was: 3.0.0)
> NameNode refresh doesn't remove DataNodes that are no longer in the allowed
> list
> --------------------------------------------------------------------------------
>
> Key: HDFS-8950
> URL: https://issues.apache.org/jira/browse/HDFS-8950
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, namenode
> Affects Versions: 2.6.0
> Reporter: Daniel Templeton
> Assignee: Daniel Templeton
> Labels: 2.7.2-candidate
> Fix For: 2.7.2
>
> Attachments: HDFS-8950.001.patch, HDFS-8950.002.patch,
> HDFS-8950.003.patch, HDFS-8950.004.patch, HDFS-8950.005.patch,
> HDFS-8950.branch-2.7.patch
>
>
> If you remove a DN from NN's allowed host list (HDFS was HA) and then do NN
> refresh, it doesn't remove it actually and the NN UI keeps showing that node.
> It may try to allocate some blocks to that DN as well during an MR job. This
> issue is independent from DN decommission.
> To reproduce:
> 1. Add a DN to dfs_hosts_allow
> 2. Refresh NN
> 3. Start DN. Now NN starts seeing DN.
> 4. Stop DN
> 5. Remove DN from dfs_hosts_allow
> 6. Refresh NN -> NN is still reporting DN as being used by HDFS.
> This is different from decom because there DN is added to exclude list in
> addition to being removed from allowed list, and in that case everything
> works correctly.
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