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Posted to issues@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2020/02/27 16:26:01 UTC

[jira] [Commented] (ARROW-560) [C++] Add support for zero-copy libhdfs reads

    [ https://issues.apache.org/jira/browse/ARROW-560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17046781#comment-17046781 ] 

Antoine Pitrou commented on ARROW-560:
--------------------------------------

One caveat here is that positioned reads (ReadAt) are not supported with zero-copy in libhdfs. I don't know why that is, as I don't understand what would be the impossibility. I guess it just hasn't been coded. So I'm not sure it's worthwhile doing this, what do you think?

> [C++] Add support for zero-copy libhdfs reads
> ---------------------------------------------
>
>                 Key: ARROW-560
>                 URL: https://issues.apache.org/jira/browse/ARROW-560
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>              Labels: filesystem
>
> See *Rz* functions in https://github.com/apache/arrow/blob/master/cpp/thirdparty/hadoop/include/hdfs.h



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