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From "Xuefu Zhang (JIRA)" <>
Subject [jira] [Commented] (HIVE-5775) Introduce Cost Based Optimizer to Hive
Date Sat, 21 Jun 2014 23:24:24 GMT


Xuefu Zhang commented on HIVE-5775:

Thanks to all for working on this. I'm not sure if this has ever surfaced, but I'm wondering
if this cost based optimization is specific to Tez. From the design doc it seems that this
new optimizer was plugged in the logical layer, while certain cost estimations are based on
Tez such as vertex. Obviously the cost for a given query would be different for MapReduce
vs Tez, but cost based optimization is equally valuable to both MR and Tez. However, applying
an optimization based on one execution engine may cause adverse result when the configured
engine is of another type. Therefore, I'd like know if any thoughts has been given and what's
plan to address this.

> Introduce Cost Based Optimizer to Hive
> --------------------------------------
>                 Key: HIVE-5775
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Laljo John Pullokkaran
>            Assignee: Laljo John Pullokkaran
>         Attachments: CBO-2.pdf, HIVE-5775.1.patch

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