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From "Liang-Chi Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-17556) Executor side broadcast for broadcast joins
Date Fri, 23 Sep 2016 13:45:21 GMT

    [ https://issues.apache.org/jira/browse/SPARK-17556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15516490#comment-15516490
] 

Liang-Chi Hsieh commented on SPARK-17556:
-----------------------------------------

[~Fei Wang] I quickly go through your design doc. Looks like you still need to collect the
content of RDD to the driver. I don't think it is not executor side broadcast means in this
jira's description. You can refer to the PR I submitted with which we don't need to collect
the RDD back to the driver.

> Executor side broadcast for broadcast joins
> -------------------------------------------
>
>                 Key: SPARK-17556
>                 URL: https://issues.apache.org/jira/browse/SPARK-17556
>             Project: Spark
>          Issue Type: New Feature
>          Components: Spark Core, SQL
>            Reporter: Reynold Xin
>         Attachments: executor broadcast.pdf
>
>
> Currently in Spark SQL, in order to perform a broadcast join, the driver must collect
the result of an RDD and then broadcast it. This introduces some extra latency. It might be
possible to broadcast directly from executors.



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