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Re: Progress on Arrow RPC a.k.a. Arrow Flight

FYI, if you want to see an example server you can run with a GRPC generated
client, you can run the ExampleFlightServer located at [1]. Very basic
'test' with that class and client is located at [2].


On Thu, May 24, 2018 at 11:51 AM, Jacques Nadeau <jacques@xxxxxxxxxx> wrote:

> Hey All,
> I used my Strata talk today as a forcing function to make additional
> progress on a GRPC-based Arrow RPC protocol [1]. I’m calling it “Apache
> Arrow Flight”. You can take a look at the work here [2]. I’ll work to clean
> up my work and explain my thoughts about the protocol in the coming days.
> High-level: use protobuf as a encapsulation format so that any client that
> is supported in GRPC will work. However, we can optimize the read/write
> path for targeted languages and hand control the
> serialization/deserialization and memory handling. (I did that in this Java
> patch [3][4][5].) I also looked at starting to use GRPC generated bindings
> within Python but it looks like some glue code may be needed in the C++
> layer since Python delegates down frequently. I also am still trying to
> understand GRPC back-pressure patterns and whether the protocol
> realistically needs to change to cover real-world high performance use
> cases.
> I’ll send out some slides about the ideas and update README, etc. soon.
> Thanks,
> Jacques
> [1] https://github.com/jacques-n/arrow/blob/flight/java/flight/
> src/main/protobuf/flight.proto
> [2] http://github.com/jacques-n/arrow/
> [3] https://github.com/jacques-n/arrow/tree/flight/
> java/flight/src/main/java/org/apache/arrow/flight/grpc
> [4] https://github.com/jacques-n/arrow/blob/flight/
> java/flight/src/main/java/org/apache/arrow/flight/ArrowMessage.java#L253
> <https://github.com/jacques-n/arrow/blob/flight/java/flight/src/main/java/org/apache/arrow/flight/ArrowMessage.java#L253>
> [5] https://github.com/jacques-n/arrow/blob/flight/
> java/flight/src/main/java/org/apache/arrow/flight/ArrowMessage.java#L185