Jim Brennan created HADOOP-17758:
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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:
{noformat}
2021-06-09 21:51:12,334 WARNÂ
[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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