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https://issues.apache.org/jira/browse/SPARK-42784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mridul Muralidharan resolved SPARK-42784.
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Resolution: Fixed
> Fix the problem of incomplete creation of subdirectories in push merged
> localDir
> --------------------------------------------------------------------------------
>
> Key: SPARK-42784
> URL: https://issues.apache.org/jira/browse/SPARK-42784
> Project: Spark
> Issue Type: Bug
> Components: Shuffle, Spark Core
> Affects Versions: 3.3.2
> Reporter: Fencheng Mei
> Assignee: Fencheng Mei
> Priority: Major
> Fix For: 3.3.3, 3.5.0, 3.4.2
>
>
> After we massively enabled push-based shuffle in our production environment,
> we found some warn messages appearing in the server-side log messages.
> the warning log like:
> ShuffleBlockPusher: Pushing block shufflePush_3_0_5352_935 to
> BlockManagerId(shuffle-push-merger, zw06-data-hdp-dn08251.mt, 7337, None)
> failed.
> java.lang.RuntimeException: java.lang.RuntimeException: Cannot initialize
> merged shuffle partition for appId application_1671244879475_44020960
> shuffleId 3 shuffleMergeId 0 reduceId 935.
> After investigation, we identified the triggering mechanism of the bug。
> The driver requested two different containers on the same physical machine.
> During the creation of the 'push-merged' directory in the first container
> (container_1), the mergeDir was created first, then the subDir were created
> based on the value of the "spark.diskStore.subDirectories" parameter.
> However, the resources of container_1 were preempted during the creation of
> the sub-directories, resulting in subDir not being created (only part of it
> was created ). As the mergeDir still existed, the second container
> (container_2) was unable to create further subDir (as it assumed that all
> directories had already been created).
>
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