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https://issues.apache.org/jira/browse/HDFS-8950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14715593#comment-14715593
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Hadoop QA commented on HDFS-8950:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch |  17m 40s | Pre-patch trunk has 4 extant 
Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to 
include 2 new or modified test files. |
| {color:green}+1{color} | javac |   7m 54s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |  10m  2s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 22s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   1m 21s | There were no new checkstyle 
issues. |
| {color:green}+1{color} | whitespace |   0m  1s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 26s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 32s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   2m 33s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | native |   3m  9s | Pre-build of native portion |
| {color:green}+1{color} | hdfs tests | 163m 45s | Tests passed in hadoop-hdfs. 
|
| | | 208m 49s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12752543/HDFS-8950.003.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / a4d9acc |
| Pre-patch Findbugs warnings | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12141/artifact/patchprocess/trunkFindbugsWarningshadoop-hdfs.html
 |
| hadoop-hdfs test log | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12141/artifact/patchprocess/testrun_hadoop-hdfs.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12141/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf900.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP 
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12141/console |


This message was automatically generated.

> 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, 
> HDFS-8950.003.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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