Hisoka-X commented on code in PR #6488:
URL: https://github.com/apache/hadoop/pull/6488#discussion_r1470514489
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hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java:
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@@ -4077,6 +4077,7 @@ private interface StatisticsAggregator<T> {
STATS_DATA_CLEANER.
setName(StatisticsDataReferenceCleaner.class.getName());
STATS_DATA_CLEANER.setDaemon(true);
+ STATS_DATA_CLEANER.setContextClassLoader(null);
Review Comment:
If the thread relies on the return value of
`Thread.currentThread().getContextClassLoader()` for logical processing, it may
encounter NPE, but I checked the corresponding code. This risk should not
exist. In fact, this is a normal way of handling classloader references in the
daemon thread. You can refer
https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-7008595
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