[jira] [Work logged] (HADOOP-17758) NPE and excessive warnings after HADOOP-17728

[ASF GitHub Bot (Jira)]

     [ 
https://issues.apache.org/jira/browse/HADOOP-17758?focusedWorklogId=609783&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-609783
 ]

ASF GitHub Bot logged work on HADOOP-17758:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 10/Jun/21 15:53
            Start Date: 10/Jun/21 15:53
    Worklog Time Spent: 10m 
      Work Description: yikf commented on pull request #3096:
URL: https://github.com/apache/hadoop/pull/3096#issuecomment-858740406


   Code conflicting, Will reopen new PR later.


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

    Worklog Id:     (was: 609783)
    Time Spent: 0.5h  (was: 20m)

> NPE and excessive warnings after HADOOP-17728
> ---------------------------------------------
>
>                 Key: HADOOP-17758
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17758
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: common
>    Affects Versions: 3.4.0
>            Reporter: Jim Brennan
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> I'm noticing these warnings and NPE's when just running a simple pi test on a 
> one node cluster:
> {noformat}
> 2021-06-09 21:51:12,334 WARN  
> [org.apache.hadoop.fs.FileSystem$Statistics$StatisticsDataReferenceCleaner] 
> fs.FileSystem (FileSystem.java:run(4025)) - Exception in the cleaner thread 
> but it will continue to run
> java.lang.NullPointerException
>       at 
> org.apache.hadoop.fs.FileSystem$Statistics$StatisticsDataReferenceCleaner.run(FileSystem.java:4020)
>       at java.lang.Thread.run(Thread.java:748){noformat}
> This appears to be due to [HADOOP-17728].
> I'm not sure I understand why that change was made?  Wasn't it by design that 
> the remove should wait until something is queued?
> [~kaifeiYi] can you please investigate?



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