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Posted to issues@arrow.apache.org by "Sutou Kouhei (JIRA)" <ji...@apache.org> on 2019/06/27 06:36:00 UTC

[jira] [Assigned] (ARROW-5432) [Python] Add 'read_at' method to pyarrow.NativeFile

     [ https://issues.apache.org/jira/browse/ARROW-5432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sutou Kouhei reassigned ARROW-5432:
-----------------------------------

    Assignee: Antoine Pitrou

> [Python] Add 'read_at' method to pyarrow.NativeFile
> ---------------------------------------------------
>
>                 Key: ARROW-5432
>                 URL: https://issues.apache.org/jira/browse/ARROW-5432
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: Python
>    Affects Versions: 0.13.0
>            Reporter: Ivan Dimitrov
>            Assignee: Antoine Pitrou
>            Priority: Blocker
>              Labels: pull-request-available
>             Fix For: 0.14.0
>
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> We'd like to open a file (using HadoopFileSystem) and then read a block of data specified by the offset and the length. We don't want any read ahead to happen. 
> The libhdfs driver supprots hdfsPread, and it exposes a ReadAt method in the RandomAccessFile interface. However, there is no way to access it from python. 
> We add a read_at method to pyarrow.NativeFile that would expose this functionality. 



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