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Posted to issues@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2018/10/02 19:34:00 UTC

[jira] [Resolved] (ARROW-3404) [C++] Make CSV chunker faster

     [ https://issues.apache.org/jira/browse/ARROW-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-3404.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 0.11.0

Issue resolved by pull request 2684
[https://github.com/apache/arrow/pull/2684]

> [C++] Make CSV chunker faster
> -----------------------------
>
>                 Key: ARROW-3404
>                 URL: https://issues.apache.org/jira/browse/ARROW-3404
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>    Affects Versions: 0.11.0
>            Reporter: Antoine Pitrou
>            Assignee: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.11.0
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> Currently the CSV chunker can be the bottleneck in multi-threaded reads (starting from 6 threads, according to my experiments). One way to make it faster is to consider by default that CSV values cannot contain newline characters (overridable via a setting), and then simply search for the last newline character in each block of data.



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