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From Micah Kornfield <emkornfi...@gmail.com>
Subject Re: Streaming use cases
Date Tue, 30 Jun 2020 03:33:10 GMT
Just a clarification the functionality in Java is from Avro to Arrow (not
Arrow to Avro).



On Mon, Jun 29, 2020 at 2:25 PM Wes McKinney <wesmckinn@gmail.com> wrote:

> On Mon, Jun 29, 2020 at 4:15 PM Cindy McMullen <cmcmullen@twitter.com>
> wrote:
> >
> > Hi, Wes -
> >
> > Yes, we're using Java/Scala, but also have a good Python code base for
> our data scientists.  Our goal is to replace storage/representation of
> Thrift for ML features with some more OSS-friendly format, such as Parquet
> or Avro, and avoid writing multiple adapters.
> >
> > Ideally, we could stream data from Parquet disk in batches into
> Arrow-compatible consumers.  Is this a reasonable fit for something like
> Arrow Flight?
>
> Yes, Flight is definitely designed for that -- fast / efficient
> delivery of Arrow record batches over TCP.
>
> >
> > On Mon, Jun 29, 2020 at 2:37 PM Wes McKinney <wesmckinn@gmail.com>
> wrote:
> >>
> >> hi Cindy,
> >>
> >> Could you clarify which PL you are working in (though assuming Scala /
> >> Java judging by your e-mail address)?
> >>
> >> In C++ we have reasonably mature Parquet->Arrow reading but not yet
> >> conversion from Arrow to Avro. In Java, I am not sure what is the
> >> state of the art for getting Parquet into Arrow but this code does not
> >> live in Apache Arrow -- I know that Apache Iceberg has done some work
> >> around this but I'm not sure how consumable it is as a library.
> >> Java-Arrow does have some preliminary support for converting Arrow to
> >> Avro, I believe. So there's some engineering here to do in any case.
> >>
> >> best,
> >> Wes
> >>
> >> On Mon, Jun 29, 2020 at 2:45 PM Cindy McMullen <cmcmullen@twitter.com>
> wrote:
> >> >
> >> > Can I use Arrow to stream data from a Parquet file source and consume
> it via Avro?
>

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