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https://issues.apache.org/jira/browse/TEZ-3733?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Eagles updated TEZ-3733:
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Attachment: TEZ-3733.1.patch
> Auto-Reduce Parallelism needs to consider shuffle overhead to avoid OOM
> -----------------------------------------------------------------------
>
> Key: TEZ-3733
> URL: https://issues.apache.org/jira/browse/TEZ-3733
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Jonathan Eagles
> Assignee: Jonathan Eagles
> Attachments: TEZ-3733.1.patch
>
>
> For each fetch there is associated memory overhead per partition which can be
> enough to affect the number of tasks needed to process the data. In some
> cases the reduction can be so severe the tasks can OOM due to overhead.
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