[jira] [Commented] (DRILL-5847) Flat Parquet Reader Performance Analysis

["salim achouche (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-5847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16194035#comment-16194035 ] 

salim achouche commented on DRILL-5847:
---------------------------------------

Summary of the CPU based Enhancements:
*Improve CPU Cache Locality -*
* The current implementation performs row based processing (foreach row do; do; for each column do; ..)
* This is done to compute a batch size that can fit within a fixed memory size
* Unfortunately, even this expensive logic doesn't work as data is populated using the Value Vectors setSafe(...) APIs
* This API doesn't provide any feedback to caller as it automatically extends the allocator if the new value doesn't fit
* We propose to switch to a columnar processing to maximize CPU cache locality
*NOTE -*
* Memory batch size enforcement will be done under another JIRA that will target all operators (not just Parquet)
* [~Paul.Rogers] is leading this effort; I'll be implementing the Parquet scanner enforcement


   

> Flat Parquet Reader Performance Analysis
> ----------------------------------------
>
>                 Key: DRILL-5847
>                 URL: https://issues.apache.org/jira/browse/DRILL-5847
>             Project: Apache Drill
>          Issue Type: Sub-task
>          Components: Storage - Parquet
>    Affects Versions: 1.11.0
>            Reporter: salim achouche
>            Assignee: salim achouche
>              Labels: performance
>             Fix For: 1.12.0
>
>         Attachments: Drill Framework Enhancements.pdf
>
>
> This task is to analyze the Flat Parquet Reader logic looking for performance improvements opportunities.



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