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https://issues.apache.org/jira/browse/HDFS-15862?focusedWorklogId=644364&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-644364
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ASF GitHub Bot logged work on HDFS-15862:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 31/Aug/21 15:15
            Start Date: 31/Aug/21 15:15
    Worklog Time Spent: 10m 
      Work Description: lzx404243 commented on pull request #2724:
URL: https://github.com/apache/hadoop/pull/2724#issuecomment-908901777


   @aajisaka Thanks for the feedback! I've made the corresponding changes 
following your suggestion. Please let me know what you think.
   
   Thanks!
   


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 644364)
    Time Spent: 50m  (was: 40m)

> Rename file back to original in TestViewfsWithNfs3.testNfsRenameSingleNN
> ------------------------------------------------------------------------
>
>                 Key: HDFS-15862
>                 URL: https://issues.apache.org/jira/browse/HDFS-15862
>             Project: Hadoop HDFS
>          Issue Type: Test
>            Reporter: Zhengxi Li
>            Assignee: Zhengxi Li
>            Priority: Minor
>              Labels: pull-request-available
>         Attachments: HDFS-15862.001.patch, HDFS-15862.002.patch
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> The 
> 'org.apache.hadoop.hdfs.nfs.nfs3.TestViewfsWithNfs3.testNfsRenameSingleNN' 
> test is not idempotent and fails if run twice in the same JVM, because it 
> pollutes state shared among tests. It may be good to clean this state 
> pollution so that some other tests do not fail in the future due to the 
> shared state polluted by this test.
> Running {{TestViewfsWithNfs3.testNfsRenameSingleNN}} twice would result in 
> the second run failing with a NullPointer exception:
> {noformat}
> [ERROR] Errors:
> [ERROR]   TestViewfsWithNfs3.testNfsRenameSingleNN:317 NullPointer
> {noformat}
> The reason for this is that the {{/user1/renameSingleNN}} file is created in 
> {{setup()}}, but gets renamed in {{testNfsRenameSingl{{eNN}}}}. When the 
> second run of {{testNfsRenameSingleNN}} tries to get info of the file by its 
> original name, it returns a NullPointer since the file no longer exists.
>  
> Link to PR: https://github.com/apache/hadoop/pull/2724



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