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https://issues.apache.org/jira/browse/TEZ-3114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15142873#comment-15142873
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Jason Lowe commented on TEZ-3114:
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There's no flow control to prevent shuffle transfer events from arriving much
faster than the task can process them. If that is sustained long enough then
eventually the heap can explode.
> Shuffle OOM due to EventMetaData flood
> --------------------------------------
>
> Key: TEZ-3114
> URL: https://issues.apache.org/jira/browse/TEZ-3114
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Jason Lowe
>
> A task encountered an OOM during shuffle, and investigation of the heap dump
> showed a lot of memory being consumed by almost 3.5 million EventMetaData
> objects. Auto-parallelism had reduced the number of tasks in the vertex to 1
> and there were 2000 upstream tasks to shuffle.
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