[jira] [Commented] (SPARK-33230) FileOutputWriter jobs have duplicate JobIDs if launched in same second

["Steve Loughran (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-33230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17221581#comment-17221581 ] 

Steve Loughran commented on SPARK-33230:
----------------------------------------

Thanks. Still got some changes to work through my side to make sure the are no assumptions that app attempt is unique.

For the curious see HADOOP-17318
* Staging committer is using task attemptID (jobId+ taskId + task-attempt) for a path to the local temp dir
* Magic committer uses app attemptId for the path under the dest/__magic dir. Only an issue once that committer allows >1 job to write to same dest.



> FileOutputWriter jobs have duplicate JobIDs if launched in same second
> ----------------------------------------------------------------------
>
>                 Key: SPARK-33230
>                 URL: https://issues.apache.org/jira/browse/SPARK-33230
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.4.7, 3.0.1
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>             Fix For: 2.4.8, 3.0.2, 3.1.0
>
>
> The Hadoop S3A staging committer has problems with >1 spark sql query being launched simultaneously, as it uses the jobID for its path in the clusterFS to pass the commit information from tasks to job committer. 
> If two queries are launched in the same second, they conflict and the output of job 1 includes that of all job2 files written so far; job 2 will fail with FNFE.
> Proposed:
> job conf to set {{"spark.sql.sources.writeJobUUID"}} to the value of {{WriteJobDescription.uuid}}
> That was the property name which used to serve this purpose; any committers already written which use this property will pick it up without needing any changes.



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