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Posted to common-dev@hadoop.apache.org by "Mingliang Liu (Jira)" <ji...@apache.org> on 2021/06/11 07:42:00 UTC
[jira] [Reopened] (HADOOP-17728) Deadlock in FileSystem
StatisticsDataReferenceCleaner cleanUp
[ https://issues.apache.org/jira/browse/HADOOP-17728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mingliang Liu reopened HADOOP-17728:
------------------------------------
> Deadlock in FileSystem StatisticsDataReferenceCleaner cleanUp
> -------------------------------------------------------------
>
> Key: HADOOP-17728
> URL: https://issues.apache.org/jira/browse/HADOOP-17728
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 3.2.1
> Reporter: yikf
> Assignee: yikf
> Priority: Minor
> Labels: pull-request-available, reverted
> Time Spent: 5h 10m
> 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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