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https://issues.apache.org/jira/browse/HDFS-16831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17628335#comment-17628335
 ] 

ASF GitHub Bot commented on HDFS-16831:
---------------------------------------

hadoop-yetus commented on PR #5098:
URL: https://github.com/apache/hadoop/pull/5098#issuecomment-1302122207

   :broken_heart: **-1 overall**
   
   
   
   
   
   
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|
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   |  |   | 146m 28s |  |  |
   
   
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   | GITHUB PR | https://github.com/apache/hadoop/pull/5098 |
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   | Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
   
   
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> [RBF SBN] GetNamenodesForNameserviceId should shuffle Observer NameNodes 
> every time
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-16831
>                 URL: https://issues.apache.org/jira/browse/HDFS-16831
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: ZanderXu
>            Assignee: ZanderXu
>            Priority: Major
>              Labels: pull-request-available
>
> The method getNamenodesForNameserviceId in MembershipNamenodeResolver.class 
> should shuffle Observer NameNodes every time. The current logic will return 
> the cached list and will caused all of read requests are forwarding to the 
> first observer namenode. 
>  
> The related code as bellow:
> {code:java}
> @Override
> public List<? extends FederationNamenodeContext> getNamenodesForNameserviceId(
>     final String nsId, boolean listObserversFirst) throws IOException {
>   List<? extends FederationNamenodeContext> ret = cacheNS.get(Pair.of(nsId, 
> listObserversFirst));
>   if (ret != null) {
>     return ret;
>   } 
>   ...
> }{code}



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