[
https://issues.apache.org/jira/browse/HDFS-8950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14714163#comment-14714163
]
Daniel Templeton commented on HDFS-8950:
----------------------------------------
Looking more closely at TestDecommission, the reason the two tests are failing
there is that they depend on the existence of the flaw represented by this JIRA
to work. Fixing the flaw breaks the tests. I'll need a little time to figure
out how to restructure the tests to be independent of the flaw.
> NameNode refresh doesn't remove DataNodes
> -----------------------------------------
>
> 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
> Fix For: 2.8.0
>
> Attachments: HDFS-8950.001.patch, HDFS-8950.002.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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
