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https://issues.apache.org/jira/browse/HDFS-16033?focusedWorklogId=600425&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-600425
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ASF GitHub Bot logged work on HDFS-16033:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 21/May/21 15:15
Start Date: 21/May/21 15:15
Worklog Time Spent: 10m
Work Description: yikf commented on pull request #3042:
URL: https://github.com/apache/hadoop/pull/3042#issuecomment-846025374
gentle cc @steveloughran Could you help take a look when you have a time,
please.
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Issue Time Tracking
-------------------
Worklog Id: (was: 600425)
Time Spent: 20m (was: 10m)
> 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
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Cleaner thread will be blocked if we remove reference from ReferenceQueue
> unless the `queue.enqueue` called.
> ----
> As shown below, We call ReferenceQueue.remove() now while cleanUp, Call
> chain as follow：
> *StatisticsDataReferenceCleaner#queue.remove() ->
> ReferenceQueue.remove(0) -> lock.wait(0)*
> But, lock.notifyAll is called when queue.enqueue only, so Cleaner thread
> will be blocked.
>
> 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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