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Posted to issues@arrow.apache.org by "Ivan Dimitrov (JIRA)" <ji...@apache.org> on 2019/05/28 22:11:00 UTC

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

Ivan Dimitrov created ARROW-5432:
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             Summary: [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
             Fix For: 0.13.0


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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