rok commented on code in PR #13873:
URL: https://github.com/apache/arrow/pull/13873#discussion_r950627734
##########
docs/source/cpp/flight.rst:
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@@ -172,6 +172,154 @@ request/response. On the server, they can inspect
incoming headers and
fail the request; hence, they can be used to implement custom
authentication methods.
+.. _flight-best-practices:
+
+Best practices
+==============
+
+gRPC
+----
+
+When using default gRPC transport options can be passed to it via
+:member:`arrow::flight::FlightClientOptions::generic_options`. For example:
+
+.. tab-set::
+
+ .. tab-item:: C++
+
+ .. code-block:: cpp
+
+ auto options = FlightClientOptions::Defaults();
+ // Set a very low limit at the gRPC layer to fail all calls
+
options.generic_options.emplace_back(GRPC_ARG_MAX_RECEIVE_MESSAGE_LENGTH, 4);
+
+ .. tab-item:: Python
+
+ .. code-block:: cpp
+
+ // Set a very low limit at the gRPC layer to fail all calls
+ generic_options = [("GRPC_ARG_MAX_RECEIVE_MESSAGE_LENGTH", 4)]
+ client = pyarrow.flight.FlightClient(server_uri,
generic_options=generic_options)
+
+Also see `best gRPC practices`_ and available `gRPC keys`_.
+
+Re-use clients whenever possible
+--------------------------------
+
+Closing clients causes gRPC to close and clean up connections which can take
+several seconds per connection. This will stall server and client threads if
+done too frequently. Client reuse will avoid this issue.
+
+Don’t round-robin load balance
+------------------------------
+
+`Round robin balancing`_ means every client can have an open connection to
+every server, causing an unexpected number of open connections and depleting
+server resources.
+
+Debugging
+---------
+
+Use netstat to see the number of open connections.
Review Comment:
Added.
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