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https://issues.apache.org/jira/browse/TEZ-3334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15372216#comment-15372216
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Rajesh Balamohan commented on TEZ-3334:
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+1 for custom shuffle handler.  

>> "fetching 100 pieces serially from the same mapper " 
If keep-alive connections are enabled in tez and in NM, would this be to mainly 
reduce the number of round trips?.

> Tez Custom Shuffle Handler
> --------------------------
>
>                 Key: TEZ-3334
>                 URL: https://issues.apache.org/jira/browse/TEZ-3334
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Jonathan Eagles
>
> For conditions where auto-parallelism is reduced (e.g. TEZ-3222), a custom 
> shuffle handler could help reduce the number of fetches and could more 
> efficiently fetch data. In particular if a reducer is fetching 100 pieces 
> serially from the same mapper it could do this in one fetch call. 



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