[jira] [Commented] (SPARK-49479) Non-daemon timer thread prevents Spark driver JVM from stopping

["Jayadeep Jayaraman (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-49479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17935208#comment-17935208 ] 

Jayadeep Jayaraman commented on SPARK-49479:
--------------------------------------------

[~beliefer] - can you pls assign the Jira to my id and also resolve the Jira. 

> Non-daemon timer thread prevents Spark driver JVM from stopping
> ---------------------------------------------------------------
>
>                 Key: SPARK-49479
>                 URL: https://issues.apache.org/jira/browse/SPARK-49479
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 4.0.0, 3.5.2
>            Reporter: Xi Chen
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>
> It is observed that when using [Spark Torch Distributor|https://spark.apache.org/docs/latest/api/python/reference/api/pyspark.ml.torch.distributor.TorchDistributor.html], Spark driver pod could hang around after calling {_}spark.stop(){_}. Although the Spark Context was shutdown, the JVM was still running.
> The reason was that there is a non-daemon timer thread named {_}BarrierCoordinator barrier epoch increment timer{_}, which prevented the driver JVM from stopping. In SPARK-46895 we replaced the timer with non-daemon single thread scheduled executor, but the issue still exists.
> We should use daemon single thread scheduled executor instead.



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