hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Rui Li (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-9097) Support runtime skew join for more queries [Spark Branch]
Date Tue, 16 Dec 2014 11:43:13 GMT

     [ https://issues.apache.org/jira/browse/HIVE-9097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rui Li updated HIVE-9097:
-------------------------
    Status: Patch Available  (was: Open)

> Support runtime skew join for more queries [Spark Branch]
> ---------------------------------------------------------
>
>                 Key: HIVE-9097
>                 URL: https://issues.apache.org/jira/browse/HIVE-9097
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Rui Li
>            Assignee: Rui Li
>         Attachments: HIVE-9097.1-spark.patch
>
>
> After HIVE-8913, runtime skew join is enabled for spark. But currently the optimization
only supports the simplest case where join is the leaf ReduceWork in a work graph. This is
because the results from the original join and the conditional map join have to be unioned
to feed to downstream works, which can be a little tricky for spark.
> This JIRA is to research and find a way to relax the above restriction. A possible solution
is to break the original task into two tasks on the join work, and insert the conditional
task in between.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message