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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2023/03/14 09:27:00 UTC
[jira] [Assigned] (SPARK-42784) Fix the problem of incomplete creation of subdirectories in push merged localDir
[ https://issues.apache.org/jira/browse/SPARK-42784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-42784:
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Assignee: Apache Spark
> 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: Apache Spark
> Priority: Major
>
> 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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