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https://issues.apache.org/jira/browse/TEZ-1157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14116314#comment-14116314
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Gopal V commented on TEZ-1157:
------------------------------
Tested with the WIP patch
{code}
$ yarn logs -applicationId application_1408148409003_0490 | grep HttpConn | wc
-l
2000
$ yarn logs -applicationId application_1408148409003_0491 | grep HttpConn | wc
-l
19
{code}
The speeds are about the same, half a second worse with the patch enabled -
possibly due to running tests in a 10GbE single rack cluster.
> Optimize broadcast :- Tasks pertaining to same job in same machine should not
> download multiple copies of broadcast data
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: TEZ-1157
> URL: https://issues.apache.org/jira/browse/TEZ-1157
> Project: Apache Tez
> Issue Type: Sub-task
> Reporter: Rajesh Balamohan
> Assignee: Gopal V
> Labels: performance
> Attachments: TEZ-1152.WIP.patch, TEZ-1157.3.WIP.patch,
> TEZ-1157.4.WIP.patch, TEZ-1157.5.WIP.patch,
> TEZ-broadcast-shuffle+vertex-parallelism.patch
>
>
> Currently tasks (belonging to same job) running in the same machine download
> its own copy of broadcast data. Optimization could be to download one copy
> in the machine, and the rest of the tasks can refer to this downloaded copy.
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