[jira] [Resolved] (TEZ-2881) Fix the InputBuffer bottleneck during the in-memory spill merge

["Gopal V (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TEZ-2881?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal V resolved TEZ-2881.
--------------------------
    Resolution: Not A Problem

> Fix the InputBuffer bottleneck during the in-memory spill merge
> ---------------------------------------------------------------
>
>                 Key: TEZ-2881
>                 URL: https://issues.apache.org/jira/browse/TEZ-2881
>             Project: Apache Tez
>          Issue Type: Sub-task
>    Affects Versions: 0.8.0-alpha
>            Reporter: Gopal V
>            Assignee: Gopal V
>
> {code}
>   public void reset(ByteBuffer b, int start, int length) {
>       resize(length);
>       b.position(start);
>       b.get(buffer, 0, length);
>       super.reset(buffer, 0, length);
>     }
> {code}
> hits cpu-mem bandwidth & is mostly stalled waiting for the data.
> Remove this dirty write and switch over to access buffers directly.



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