[
https://issues.apache.org/jira/browse/HADOOP-17728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Mingliang Liu resolved HADOOP-17728.
------------------------------------
Fix Version/s: 3.2.3
3.4.0
3.3.1
Hadoop Flags: Reviewed
Resolution: Fixed
Committed to 3.1+ Thanks for your reporting and contribution [~kaifeiYi].
Thanks for your review [~ste...@apache.org]
> 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
> Fix For: 3.3.1, 3.4.0, 3.2.3
>
> 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}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: common-issues-h...@hadoop.apache.org
