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https://issues.apache.org/jira/browse/HDFS-17265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17789915#comment-17789915
 ] 

ASF GitHub Bot commented on HDFS-17265:
---------------------------------------

hadoop-yetus commented on PR #6298:
URL: https://github.com/apache/hadoop/pull/6298#issuecomment-1827183714

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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   |  |   | 162m 58s |  |  |
   
   
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> RBF: Throwing an exception prevents the permit from being released when using 
> FairnessPolicyController
> ------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-17265
>                 URL: https://issues.apache.org/jira/browse/HDFS-17265
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Jian Zhang
>            Assignee: Jian Zhang
>            Priority: Major
>              Labels: pull-request-available
>
> *Bug description*
> When the router uses FairnessPolicyController, each time a request is 
> processed,
> the permit of the ns corresponding to the request will be obtained first 
> {*}(method acquirePermit){*},
> and then the  information of namenodes corresponding to the ns will be 
> obtained{*}(method getOrderedNamenodes){*}.
> getOrderedNamenodes comes after acquirePermit, so if acquirePermit succeeds 
> but getOrderedNamenodes throws an exception, the permit cannot be released.
>  
> *How to reproduce*
> Use the original code to run the new unit test 
> testReleasedWhenExceptionOccurs in this PR
>  
>  



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