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Posted to issues@spark.apache.org by "Dongjoon Hyun (Jira)" <ji...@apache.org> on 2020/03/16 22:51:07 UTC
[jira] [Updated] (SPARK-29169) Performance regression in ORC
Vectorized on TINYINT scans
[ https://issues.apache.org/jira/browse/SPARK-29169?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dongjoon Hyun updated SPARK-29169:
----------------------------------
Affects Version/s: (was: 3.0.0)
3.1.0
> Performance regression in ORC Vectorized on TINYINT scans
> ---------------------------------------------------------
>
> Key: SPARK-29169
> URL: https://issues.apache.org/jira/browse/SPARK-29169
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Maxim Gekk
> Priority: Major
>
> The updated benchmark results show performance regression *(almost 2 times slower)* in ORC Vectorized on scanning Single TINYINT Column, see https://github.com/apache/spark/pull/25828/files#diff-e37c3433287c7371ff9c2404db821095R13 . Need to find out the root cause of this and fix it.
> Old results:
> {code}
> SQL Single TINYINT Column Scan: Best/Avg Time(ms) Rate(M/s) Per Row(ns) Relative
> SQL ORC Vectorized 167 / 174 94.2 10.6 157.9X
> {code}
> New results:
> {code}
> SQL Single TINYINT Column Scan: Best Time(ms) Avg Time(ms) Stdev(ms) Rate(M/s) Per Row(ns) Relative
> SQL ORC Vectorized 329 347 25 47.9 20.9 72.9X
> {code}
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