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

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

Lewis John McGibbney (Jira)
Jim Brennan created HADOOP-17758:

             Summary: 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

I'm noticing these warnings and NPE's when just running a simple pi test on a one node cluster:
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
        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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