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https://issues.apache.org/jira/browse/ARROW-10106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17202680#comment-17202680
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David Li commented on ARROW-10106:
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This would be a great improvement. I also think having a gRPC-style async API
with a StreamObserver-like API would be useful for applications that are
concerned with efficiency; FlightStream/FlightProducer is a very convenient
API, but the internals do quite a bit of work on behalf of the user to achieve
that.
> [FlightRPC][Java] Expose onIsReady() callback on OutboundStreamListener
> -----------------------------------------------------------------------
>
> Key: ARROW-10106
> URL: https://issues.apache.org/jira/browse/ARROW-10106
> Project: Apache Arrow
> Issue Type: Improvement
> Components: FlightRPC, Java
> Reporter: James Duong
> Priority: Major
>
> OutboundStreamListener has a method isReady() that FlightProducers need to
> poll during implementations of getStream() to avoid buffering too much data.
> An enhancement would be to allow setting a callback to run (for example,
> notifying a CountdownLatch) so that FlightProducer implementations don't need
> to busy wait.
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