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From "Dapeng Sun (JIRA)" <>
Subject [jira] [Commented] (HIVE-15682) Eliminate per-row based dummy iterator creation
Date Mon, 13 Feb 2017 09:02:42 GMT


Dapeng Sun commented on HIVE-15682:

Hi Xuefu, sorry, I didn't receive the email notification of this JIRA. 

Do you mean you want to test {{order by}} likes {{`select count(*) from (select request_lat
from dwh.fact_trip where datestr > '2017-01-27' order by request_lat) x;`}} about {{ w/
HIVE-15580 }}, {{ w/o HIVE-15580 }} at my environment?

> Eliminate per-row based dummy iterator creation
> -----------------------------------------------
>                 Key: HIVE-15682
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: Spark
>    Affects Versions: 2.2.0
>            Reporter: Xuefu Zhang
>            Assignee: Xuefu Zhang
>             Fix For: 2.2.0
>         Attachments: HIVE-15682.patch
> HIVE-15580 introduced a dummy iterator per input row which can be eliminated. This is
because {{SparkReduceRecordHandler}} is able to handle single key value pairs. We can refactor
this part of code 1. to remove the need for a iterator and 2. to optimize the code path for
per (key, value) based (instead of (key, value iterator)) processing. It would be also great
if we can measure the performance after the optimizations and compare to performance prior
to HIVE-15580.

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