[jira] [Commented] (SPARK-39283) Spark tasks stuck forever due to deadlock between TaskMemoryManager and UnsafeExternalSorter

["Sandeep Pal (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-39283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17542113#comment-17542113 ] 

Sandeep Pal commented on SPARK-39283:
-------------------------------------

[~cloud_fan] This seems to occur frequently on spark 3.1.2, let me know if you need more information from my side. 

> Spark tasks stuck forever due to deadlock between TaskMemoryManager and UnsafeExternalSorter
> --------------------------------------------------------------------------------------------
>
>                 Key: SPARK-39283
>                 URL: https://issues.apache.org/jira/browse/SPARK-39283
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 3.1.2
>            Reporter: Sandeep Pal
>            Priority: Critical
>              Labels: Deadlock, spark3.0
>         Attachments: DeadlockSparkTasks.png
>
>
> We are seems this deadlock between {{TaskMemoryManager}} and {{UnsafeExternalSorter}} pretty often on our workload. Sometime, the retry is successful but sometimes we have to do hacky ways to break the deadlocks such as turning down the worker machines explicitly. 
> Below is the thread dump from the Spark UI showing the deadlock :
> !DeadlockSparkTasks.png!
>  
> I believe there was a related Jira on the similar deadlock between the same threads and it was resolved. 
> https://issues.apache.org/jira/browse/SPARK-27338
>  
>  



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