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https://issues.apache.org/jira/browse/TEZ-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14737097#comment-14737097
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Jonathan Eagles commented on TEZ-2791:
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[~saikatr], we have seen something similar. Is this the same issue as what we 
have been seeing on certain jobs?

> Reduce tez.runtime.shuffle.fetch.buffer.percent default value to avoid corner 
> case OOMs
> ---------------------------------------------------------------------------------------
>
>                 Key: TEZ-2791
>                 URL: https://issues.apache.org/jira/browse/TEZ-2791
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Rajesh Balamohan
>
> Default value for tez.runtime.shuffle.fetch.buffer.percent is set to 0.9. In 
> corner cases & based on scheduling & data sizes, it is possible that JVM 
> crosses old-gen threshold and ends up throwing OOM. It would be better to set 
> the default value to 0.6.



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