yikf opened a new pull request #3096:
URL: https://github.com/apache/hadoop/pull/3096
After HADOOP-17728, `StatisticsDataReferenceCleaner` may appear the
following questions, That's beacuse `ReferenceQueue.remove` might return `null`.
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)
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