billyean opened a new issue, #431:
URL: https://github.com/apache/arrow-java/issues/431
### Describe the usage question you have. Please include as many useful
details as possible.
Arrow version: 15.
Client: C++
Server: Java
I have a Java arrow flight server that uses doExchange to read the context,
my server code is as follows, I have identified in multiple thread environment,
in the tests many calls would stuck at the line ```FlightDescriptor descriptor
= reader.getDescriptor();``` in the second time(Which means the first call in
the same thread usually is not blocked), and which makes the following requests
also stucks.
``` public void doExchange(CallContext context, FlightStream reader,
ServerStreamListener writer) {
log.info("Start to call doExchange.........");
// Trying to
try (BufferAllocator allocator = allocatorPool.submit(
() -> this.allocator.newChildAllocator("exchange", 0,
Long.MAX_VALUE)).get()) {
FlightDescriptor descriptor = reader.getDescriptor();
List<String> path = descriptor.getPath();
String type = path.get(0);
String funcSignature = path.get(1);
...
```
The client code is as follows
```
std::vector<std::shared_ptr<RecordBatch>> UDFClient::Call(
const std::vector<std::string>& paths,
std::shared_ptr<RecordBatch>& batch) const {
// Create a FlightDescriptor using a path
FlightDescriptor descriptor = FlightDescriptor::Path(paths);
auto exchange_result = Client_->DoExchange(descriptor);
if (!exchange_result.ok()) {
throw std::runtime_error("Do exchange descriptor: "
+ exchange_result.status().ToString());
}
auto exchange = std::move(exchange_result.ValueUnsafe());
...
```
I understand ```reader.getDescriptor(); ``` is a blocking call that will use
future to wait the descriptor sent. Since doExchange in the server has been
called, I assume the client ```auto exchange_result =
Client_->DoExchange(descriptor);``` has been received. I can't figure what
could make ```reader.getDescriptor();``` stuck, I am reporting this to the
community that want to know is this a bug or there is something I did wrong.
Thank you
### Component(s)
C++, FlightRPC, Java
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