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https://issues.apache.org/jira/browse/HDFS-8950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14720866#comment-14720866
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Hudson commented on HDFS-8950:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #319 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/319/])
HDFS-8950. NameNode refresh doesn't remove DataNodes that are no longer in the
allowed list (Daniel Templeton) (cmccabe: rev
b94b56806d3d6e04984e229b479f7ac15b62bbfa)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestHostFileManager.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestDatanodeManager.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDecommission.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/HostFileManager.java
> 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
> Fix For: 2.8.0
>
> Attachments: HDFS-8950.001.patch, HDFS-8950.002.patch,
> HDFS-8950.003.patch, HDFS-8950.004.patch, HDFS-8950.005.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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