[jira] [Commented] (ARROW-501) [C++] Implement concurrent / buffering InputStream for streaming data use cases

["Wes McKinney (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16593028#comment-16593028 ] 

Wes McKinney commented on ARROW-501:
------------------------------------

I was thinking we could use {{std::future}} to implement this, but it seems that there is quite a bit of overhead associated with this in many cases (see e.g. https://www.quora.com/Why-is-C++11-std-future-so-slow). It may be better to spawn a single thread that blocks on a condition variable so that it can be notified when {{Next}} is called to begin reading the next chunk

> [C++] Implement concurrent / buffering InputStream for streaming data use cases
> -------------------------------------------------------------------------------
>
>                 Key: ARROW-501
>                 URL: https://issues.apache.org/jira/browse/ARROW-501
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>             Fix For: 0.13.0
>
>
> Related to ARROW-500, when processing an input data stream, we may wish to continue buffering input (up to an maximum buffer size) in between synchronous Read calls



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