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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (HADOOP-17758) NPE and excessive warnings after HADOOP-17728
Date Mon, 14 Jun 2021 07:26:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-17758?focusedWorklogId=610182&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-610182

ASF GitHub Bot logged work on HADOOP-17758:

                Author: ASF GitHub Bot
            Created on: 14/Jun/21 07:25
            Start Date: 14/Jun/21 07:25
    Worklog Time Spent: 10m 
      Work Description: yikf commented on pull request #3098:
URL: https://github.com/apache/hadoop/pull/3098#issuecomment-859316722

   gentle ping @liuml07 Could you help me take a look when you have a time, in https://github.com/apache/hadoop/pull/3042,
we seems missing something, sorry.

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Issue Time Tracking

    Worklog Id:     (was: 610182)
    Time Spent: 1h  (was: 50m)

> 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: 1h
>  Remaining Estimate: 0h
> I'm noticing these warnings and NPE's when just running a simple pi test on a one node
> {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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