[jira] [Resolved] (SPARK-50118) Spark removes working directory while Python UDF runs

["Hyukjin Kwon (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-50118?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-50118.
----------------------------------
    Fix Version/s: 4.0.0
       Resolution: Fixed

Issue resolved by pull request 48665
[https://github.com/apache/spark/pull/48665]

> Spark removes working directory while Python UDF runs
> -----------------------------------------------------
>
>                 Key: SPARK-50118
>                 URL: https://issues.apache.org/jira/browse/SPARK-50118
>             Project: Spark
>          Issue Type: Bug
>          Components: Connect, PySpark
>    Affects Versions: 3.5.2
>            Reporter: Peter Andrew
>            Assignee: Hyukjin Kwon
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>
> With Spark Connect + PySpark, we can stage files using `spark.addArtifacts`. When a Python UDF is executed, the working directory is set to a folder with the corresponding artifacts available.
> I have observed on large scale jobs with long running tasks (>45 mins) that Spark sometimes removes that working directory, even though UDF tasks are still running. This can be seen by periodically running `os.getcwd()` in the UDF, which raises `FileNotFoundError`.
> This seems to coincide with log records indicating 'Session evicted: <uuid>`, from [`isolatedSessionCache`.|#L212] There is a 30 minute timeout here that might be to blame.
> I have not yet been able to write a simple program to reproduce. I suspect that there might be a conjunction of multiple events, such as when a task is scheduled on an executor 30 mins after the last task started. https://issues.apache.org/jira/browse/SPARK-44290 might be relevant.
> cc [~gurwls223] 



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