Daniel Templeton created HDFS-8950:
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Summary: 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
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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