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https://issues.apache.org/jira/browse/ARROW-4283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17643162#comment-17643162
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Rémi Dettai commented on ARROW-4283:
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Hi! I would like to revive this thread. We have a similar usecase where we need
an async interface in PyArrow for IPC streams.
> RecordBatchStreamReader: this is too high-level; you need to read from your
> data source in Python (using `await something.read()`) then construct a
> record batch out of the data (perhaps with a BufferReader)
To be able to construct the record batch, we need to know how much bytes we
need to read. Getting that information implies:
* reading the metadata size
* parsing the metadata
* getting the body size from the parsed metadata
*The big issue here is that PyArrow doesn't seem to expose the right primitives
for that, in particular parsing the metadata.*
I believe that asyncio is quickly gaining in popularity, and Arrow being an
exchange format, it will end up being used in a lot of use cases like the one
mentioned by [~paul.e.taylor] where async is very valuable.
> [Python] Should RecordBatchStreamReader/Writer be AsyncIterable?
> ----------------------------------------------------------------
>
> Key: ARROW-4283
> URL: https://issues.apache.org/jira/browse/ARROW-4283
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Paul Taylor
> Priority: Minor
>
> Filing this issue after a discussion today with [~xhochy] about how to
> implement streaming pyarrow http services. I had attempted to use both Flask
> and [aiohttp|https://aiohttp.readthedocs.io/en/stable/streams.html]'s
> streaming interfaces because they seemed familiar, but no dice. I have no
> idea how hard this would be to add -- supporting all the asynciterable
> primitives in JS was non-trivial.
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