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https://issues.apache.org/jira/browse/TEZ-4135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17063053#comment-17063053
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Rajesh Balamohan commented on TEZ-4135:
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Sure, TEZ-3645 should be helpful as well in. Will check. Thanks [~jeagles]. 
"codec.createInputStream" explicitly creates 256KB buffer, but in this case tez 
already has info on the decompressed and compressed bytes. So it can reduce the 
memory requested in such cases.

> Improve memory allocation when executing in-memory reads
> --------------------------------------------------------
>
>                 Key: TEZ-4135
>                 URL: https://issues.apache.org/jira/browse/TEZ-4135
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: Rajesh Balamohan
>            Priority: Major
>         Attachments: Screenshot 2020-03-16 at 6.34.42 PM.jpg
>
>
> !Screenshot 2020-03-16 at 6.34.42 PM.jpg|width=824,height=575!



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