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https://issues.apache.org/jira/browse/ARROW-7200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16978596#comment-16978596
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Antoine Pitrou commented on ARROW-7200:
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"{{@@}}" is probably just the start of the HTTP2 protocol, you can ignore it.
The important thing is that the connection succeeds. Unfortunately, it's
starting to get difficult to me to help you more here :-/
[~lidavidm], perhaps you have an idea about this?
> Running Arrow Flight benchmark on two hosts doesn't work
> --------------------------------------------------------
>
> Key: ARROW-7200
> URL: https://issues.apache.org/jira/browse/ARROW-7200
> Project: Apache Arrow
> Issue Type: Bug
> Components: Benchmarking, C++, FlightRPC
> Affects Versions: 0.15.0, 0.15.1
> Environment: AWS EC2
> Instance type: t3a.xlarge
> AMI: ubuntu/images/hvm-ssd/ubuntu-bionic-18.04-amd64-server-20191002
> Number of instances: 2
> They are capable of pinging each other.
> Reporter: Chengxin Ma
> Priority: Major
> Attachments: Screen Shot 2019-11-18 at 16.00.38.png, Screen Shot
> 2019-11-19 at 14.41.40.png
>
>
> I was trying to evaluate the performance of Apache Arrow Flight on two hosts
> (one as the client and the other one as the server), using [the official
> benchmark|[https://github.com/apache/arrow/blob/master/cpp/src/arrow/flight/flight_benchmark.cc]].
> Flags I used to build the project were:
>
> {code:java}
> -DARROW_FLIGHT=ON
> -DCMAKE_BUILD_TYPE=Debug
> -DARROW_BUILD_BENCHMARKS=ON
> {code}
>
> The branch I used was maint-0.15.x since there was a build error on the
> master branch. _(The build error on master only existed in the environment
> where I set up two hosts: AWS. On my local environment (macOS) the build was
> successful on the master branch. I don't think this build error is relevant
> to the issue since there is no difference in the cpp source code.)_
> On the host acting as the server, I ran
> {code:java}
> ./arrow-flight-perf-server{code}
> On the host acting as the client, I ran
> {code:java}
> ./arrow-flight-benchmark --server_host ip-172-31-11-18{code}
> It gives the following error:
> {code:java}
> Failed with error: << IOError: gRPC returned unavailable error, with message:
> Connect Failed. Detail: Unavailable{code}
>
> If I ran
> {code:java}
> ./arrow-flight-benchmark --server_host ip-172-31-11-17{code}
> the error will be different:
> {code:java}
> IOError: Server was not available after 10 attempts{code}
> This is understandable since this host doesn't exist at all.
> This indicates that Flight is able to find the existing host
> (ip-172-31-11-18), but the communication somehow didn't succeed.
> The benchmark works fine if I run it with the localhost, either by not
> specifying the server_host flag or running the server in another process on
> the same host.
> I am not sure if the problem is in the environment or in the code itself.
> Could someone please give me some hint on how to resolve the problem?
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