yikf created HDFS-16033:
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Summary: Fix issue of the StatisticsDataReferenceCleaner cleanUp
Key: HDFS-16033
URL: https://issues.apache.org/jira/browse/HDFS-16033
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs
Affects Versions: 3.2.1
Reporter: yikf
Cleaner thread will be blocked if we remove ref from ReferenceQueue unless the
`queue.enqueue` called.
ThreadDump:
{code:java}
"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007f7afc088800
nid=0x2119 in Object.wait() [0x00007f7b00230000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000c00c2f58> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
- locked <0x00000000c00c2f58> (a java.lang.ref.Reference$Lock)
at
java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153){code}
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