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| |
| <section id="arrow-flight-rpc"> |
| <h1>Arrow Flight RPC<a class="headerlink" href="#arrow-flight-rpc" title="Permalink to this heading">¶</a></h1> |
| <p>Arrow Flight is an RPC framework for efficient transfer of Flight data |
| over the network.</p> |
| <div class="admonition seealso"> |
| <p class="admonition-title">See also</p> |
| <dl class="simple"> |
| <dt><a class="reference internal" href="../format/Flight.html"><span class="doc">Flight protocol documentation</span></a></dt><dd><p>Documentation of the Flight protocol, including how to use |
| Flight conceptually.</p> |
| </dd> |
| <dt><a class="reference internal" href="api/flight.html"><span class="doc">Flight API documentation</span></a></dt><dd><p>C++ API documentation listing all of the various client and |
| server types.</p> |
| </dd> |
| <dt><a class="reference external" href="https://arrow.apache.org/cookbook/cpp/flight.html">C++ Cookbook</a></dt><dd><p>Recipes for using Arrow Flight in C++.</p> |
| </dd> |
| </dl> |
| </div> |
| <section id="writing-a-flight-service"> |
| <h2>Writing a Flight Service<a class="headerlink" href="#writing-a-flight-service" title="Permalink to this heading">¶</a></h2> |
| <p>Servers are subclasses of <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight16FlightServerBaseE" title="arrow::flight::FlightServerBase"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::flight::FlightServerBase</span></code></a>. To |
| implement individual RPCs, override the RPC methods on this class.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="k">class</span><span class="w"> </span><span class="nc">MyFlightServer</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="n">FlightServerBase</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">Status</span><span class="w"> </span><span class="nf">ListFlights</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">ServerCallContext</span><span class="o">&</span><span class="w"> </span><span class="n">context</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">Criteria</span><span class="o">*</span><span class="w"> </span><span class="n">criteria</span><span class="p">,</span> |
| <span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">FlightListing</span><span class="o">>*</span><span class="w"> </span><span class="n">listings</span><span class="p">)</span><span class="w"> </span><span class="k">override</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o"><</span><span class="n">FlightInfo</span><span class="o">></span><span class="w"> </span><span class="n">flights</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">...;</span> |
| <span class="w"> </span><span class="o">*</span><span class="n">listings</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">FlightListing</span><span class="o">></span><span class="p">(</span><span class="k">new</span><span class="w"> </span><span class="n">SimpleFlightListing</span><span class="p">(</span><span class="n">flights</span><span class="p">));</span> |
| <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">Status</span><span class="o">::</span><span class="n">OK</span><span class="p">();</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="p">};</span> |
| </pre></div> |
| </div> |
| <p>Each RPC method always takes a |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight17ServerCallContextE" title="arrow::flight::ServerCallContext"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::flight::ServerCallContext</span></code></a> for common parameters and |
| returns a <a class="reference internal" href="api/support.html#_CPPv4N5arrow6StatusE" title="arrow::Status"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Status</span></code></a> to indicate success or |
| failure. Flight-specific error codes can be returned via |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight15MakeFlightErrorE16FlightStatusCodeNSt6stringENSt6stringE" title="arrow::flight::MakeFlightError"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">arrow::flight::MakeFlightError()</span></code></a>.</p> |
| <p>RPC methods that return a value in addition to a status will use an |
| out parameter, as shown above. Often, there are helper classes |
| providing basic implementations of these out parameters. For instance, |
| above, <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight19SimpleFlightListingE" title="arrow::flight::SimpleFlightListing"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::flight::SimpleFlightListing</span></code></a> uses a vector of |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight10FlightInfoE" title="arrow::flight::FlightInfo"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::flight::FlightInfo</span></code></a> objects as the result of a |
| <code class="docutils literal notranslate"><span class="pre">ListFlights</span></code> RPC.</p> |
| <p>To start a server, create a <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight8LocationE" title="arrow::flight::Location"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::flight::Location</span></code></a> to |
| specify where to listen, and call |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight16FlightServerBase4InitERK19FlightServerOptions" title="arrow::flight::FlightServerBase::Init"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">arrow::flight::FlightServerBase::Init()</span></code></a>. This will start the |
| server, but won’t block the rest of the program. Use |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight16FlightServerBase20SetShutdownOnSignalsEKNSt6vectorIiEE" title="arrow::flight::FlightServerBase::SetShutdownOnSignals"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">arrow::flight::FlightServerBase::SetShutdownOnSignals()</span></code></a> to |
| enable stopping the server if an interrupt signal is received, then |
| call <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight16FlightServerBase5ServeEv" title="arrow::flight::FlightServerBase::Serve"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">arrow::flight::FlightServerBase::Serve()</span></code></a> to block until the |
| server stops.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">flight</span><span class="o">::</span><span class="n">FlightServerBase</span><span class="o">></span><span class="w"> </span><span class="n">server</span><span class="p">;</span> |
| <span class="c1">// Initialize server</span> |
| <span class="n">arrow</span><span class="o">::</span><span class="n">flight</span><span class="o">::</span><span class="n">Location</span><span class="w"> </span><span class="n">location</span><span class="p">;</span> |
| <span class="c1">// Listen to all interfaces on a free port</span> |
| <span class="n">ARROW_CHECK_OK</span><span class="p">(</span><span class="n">arrow</span><span class="o">::</span><span class="n">flight</span><span class="o">::</span><span class="n">Location</span><span class="o">::</span><span class="n">ForGrpcTcp</span><span class="p">(</span><span class="s">"0.0.0.0"</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">location</span><span class="p">));</span> |
| <span class="n">arrow</span><span class="o">::</span><span class="n">flight</span><span class="o">::</span><span class="n">FlightServerOptions</span><span class="w"> </span><span class="nf">options</span><span class="p">(</span><span class="n">location</span><span class="p">);</span> |
| |
| <span class="c1">// Start the server</span> |
| <span class="n">ARROW_CHECK_OK</span><span class="p">(</span><span class="n">server</span><span class="o">-></span><span class="n">Init</span><span class="p">(</span><span class="n">options</span><span class="p">));</span> |
| <span class="c1">// Exit with a clean error code (0) on SIGTERM</span> |
| <span class="n">ARROW_CHECK_OK</span><span class="p">(</span><span class="n">server</span><span class="o">-></span><span class="n">SetShutdownOnSignals</span><span class="p">({</span><span class="n">SIGTERM</span><span class="p">}));</span> |
| |
| <span class="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"Server listening on localhost:"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">server</span><span class="o">-></span><span class="n">port</span><span class="p">()</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span> |
| <span class="n">ARROW_CHECK_OK</span><span class="p">(</span><span class="n">server</span><span class="o">-></span><span class="n">Serve</span><span class="p">());</span> |
| </pre></div> |
| </div> |
| </section> |
| <section id="using-the-flight-client"> |
| <h2>Using the Flight Client<a class="headerlink" href="#using-the-flight-client" title="Permalink to this heading">¶</a></h2> |
| <p>To connect to a Flight service, create an instance of |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight12FlightClientE" title="arrow::flight::FlightClient"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::flight::FlightClient</span></code></a> by calling <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight12FlightClient7ConnectERK8Location" title="arrow::flight::FlightClient::Connect"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">Connect</span></code></a>.</p> |
| <p>Each RPC method returns <a class="reference internal" href="api/support.html#_CPPv4I0EN5arrow6ResultE" title="arrow::Result"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Result</span></code></a> to indicate the |
| success/failure of the request, and the result object if the request |
| succeeded. Some calls are streaming calls, so they will return a |
| reader and/or a writer object; the final call status isn’t known until |
| the stream is completed.</p> |
| </section> |
| <section id="cancellation-and-timeouts"> |
| <h2>Cancellation and Timeouts<a class="headerlink" href="#cancellation-and-timeouts" title="Permalink to this heading">¶</a></h2> |
| <p>When making a call, clients can optionally provide |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight17FlightCallOptionsE" title="arrow::flight::FlightCallOptions"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">FlightCallOptions</span></code></a>. This |
| allows clients to set a timeout on calls or provide custom HTTP |
| headers, among other features. Also, some objects returned by client |
| RPC calls expose a <code class="docutils literal notranslate"><span class="pre">Cancel</span></code> method which allows terminating a call |
| early.</p> |
| <p>On the server side, no additional code is needed to implement |
| timeouts. For cancellation, the server needs to manually poll |
| <a class="reference internal" href="api/flight.html#_CPPv4NK5arrow6flight17ServerCallContext12is_cancelledEv" title="arrow::flight::ServerCallContext::is_cancelled"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">ServerCallContext::is_cancelled</span></code></a> to check if the |
| client has cancelled the call, and if so, break out of any processing |
| the server is currently doing.</p> |
| </section> |
| <section id="enabling-tls"> |
| <h2>Enabling TLS<a class="headerlink" href="#enabling-tls" title="Permalink to this heading">¶</a></h2> |
| <p>TLS can be enabled when setting up a server by providing a certificate |
| and key pair to <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight16FlightServerBase4InitERK19FlightServerOptions" title="arrow::flight::FlightServerBase::Init"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">FlightServerBase::Init</span></code></a>.</p> |
| <p>On the client side, use <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight8Location10ForGrpcTlsERKNSt6stringEKi" title="arrow::flight::Location::ForGrpcTls"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">Location::ForGrpcTls</span></code></a> to construct the |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight8LocationE" title="arrow::flight::Location"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::flight::Location</span></code></a> to listen on.</p> |
| </section> |
| <section id="enabling-authentication"> |
| <h2>Enabling Authentication<a class="headerlink" href="#enabling-authentication" title="Permalink to this heading">¶</a></h2> |
| <div class="admonition warning"> |
| <p class="admonition-title">Warning</p> |
| <p>Authentication is insecure without enabling TLS.</p> |
| </div> |
| <p>Handshake-based authentication can be enabled by implementing |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight17ServerAuthHandlerE" title="arrow::flight::ServerAuthHandler"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ServerAuthHandler</span></code></a> and |
| providing this to the server during construction.</p> |
| <p>Authentication consists of two parts: on initial client connection, |
| the server and client authentication implementations can perform any |
| negotiation needed. The client authentication handler then provides a |
| token that will be attached to future calls. This is done by calling |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight12FlightClient12AuthenticateERK17FlightCallOptionsNSt10unique_ptrI17ClientAuthHandlerEE" title="arrow::flight::FlightClient::Authenticate"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">Authenticate</span></code></a> with |
| the desired client authentication implementation.</p> |
| <p>On each RPC thereafter, the client handler’s token is automatically |
| added to the call in the request headers. The server authentication |
| handler validates the token and provides the identity of the |
| client. On the server, this identity can be obtained from the |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight17ServerCallContextE" title="arrow::flight::ServerCallContext"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::flight::ServerCallContext</span></code></a>.</p> |
| </section> |
| <section id="custom-middleware"> |
| <h2>Custom Middleware<a class="headerlink" href="#custom-middleware" title="Permalink to this heading">¶</a></h2> |
| <p>Servers and clients support custom middleware (or interceptors) that |
| are called on every request and can modify the request in a limited |
| fashion. These can be implemented by subclassing <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight16ServerMiddlewareE" title="arrow::flight::ServerMiddleware"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ServerMiddleware</span></code></a> and <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight16ClientMiddlewareE" title="arrow::flight::ClientMiddleware"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ClientMiddleware</span></code></a>, then providing them when creating |
| the client or server.</p> |
| <p>Middleware are fairly limited, but they can add headers to a |
| request/response. On the server, they can inspect incoming headers and |
| fail the request; hence, they can be used to implement custom |
| authentication methods.</p> |
| </section> |
| <section id="best-practices"> |
| <span id="flight-best-practices"></span><h2>Best practices<a class="headerlink" href="#best-practices" title="Permalink to this heading">¶</a></h2> |
| <section id="grpc"> |
| <h3>gRPC<a class="headerlink" href="#grpc" title="Permalink to this heading">¶</a></h3> |
| <p>When using the default gRPC transport, options can be passed to it via |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight19FlightClientOptions15generic_optionsE" title="arrow::flight::FlightClientOptions::generic_options"><code class="xref cpp cpp-member docutils literal notranslate"><span class="pre">arrow::flight::FlightClientOptions::generic_options</span></code></a>. For example:</p> |
| <div class="sd-tab-set docutils"> |
| <input checked="checked" id="sd-tab-item-0" name="sd-tab-set-0" type="radio"> |
| </input><label class="sd-tab-label" for="sd-tab-item-0"> |
| C++</label><div class="sd-tab-content docutils"> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="k">auto</span><span class="w"> </span><span class="n">options</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">FlightClientOptions</span><span class="o">::</span><span class="n">Defaults</span><span class="p">();</span> |
| <span class="c1">// Set the period after which a keepalive ping is sent on transport.</span> |
| <span class="n">options</span><span class="p">.</span><span class="n">generic_options</span><span class="p">.</span><span class="n">emplace_back</span><span class="p">(</span><span class="n">GRPC_ARG_KEEPALIVE_TIME_MS</span><span class="p">,</span><span class="w"> </span><span class="mi">60000</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| </div> |
| <input id="sd-tab-item-1" name="sd-tab-set-0" type="radio"> |
| </input><label class="sd-tab-label" for="sd-tab-item-1"> |
| Python</label><div class="sd-tab-content docutils"> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># Set the period after which a keepalive ping is sent on transport.</span> |
| <span class="n">generic_options</span> <span class="o">=</span> <span class="p">[(</span><span class="s2">"GRPC_ARG_KEEPALIVE_TIME_MS"</span><span class="p">,</span> <span class="mi">60000</span><span class="p">)]</span> |
| <span class="n">client</span> <span class="o">=</span> <span class="n">pyarrow</span><span class="o">.</span><span class="n">flight</span><span class="o">.</span><span class="n">FlightClient</span><span class="p">(</span><span class="n">server_uri</span><span class="p">,</span> <span class="n">generic_options</span><span class="o">=</span><span class="n">generic_options</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| <p>Also see <a class="reference external" href="https://grpc.io/docs/guides/performance/#general">best gRPC practices</a> and available <a class="reference external" href="https://grpc.github.io/grpc/cpp/group__grpc__arg__keys.html">gRPC keys</a>.</p> |
| </section> |
| <section id="re-use-clients-whenever-possible"> |
| <h3>Re-use clients whenever possible<a class="headerlink" href="#re-use-clients-whenever-possible" title="Permalink to this heading">¶</a></h3> |
| <p>Creating and closing clients requires setup and teardown on the client and |
| server side which can take away from actually handling RPCs. Reuse clients |
| whenever possible to avoid this. Note that clients are thread-safe, so a |
| single client can be shared across multiple threads.</p> |
| </section> |
| <section id="dont-round-robin-load-balance"> |
| <h3>Don’t round-robin load balance<a class="headerlink" href="#dont-round-robin-load-balance" title="Permalink to this heading">¶</a></h3> |
| <p><a class="reference external" href="https://github.com/grpc/grpc/blob/master/doc/load-balancing.md#round_robin">Round robin load balancing</a> means every client can have an open connection to |
| every server, causing an unexpected number of open connections and depleting |
| server resources.</p> |
| </section> |
| <section id="debugging-connection-issues"> |
| <h3>Debugging connection issues<a class="headerlink" href="#debugging-connection-issues" title="Permalink to this heading">¶</a></h3> |
| <p>When facing unexpected disconnects on long running connections use netstat to |
| monitor the number of open connections. If number of connections is much |
| greater than the number of clients it might cause issues.</p> |
| <p>For debugging, certain environment variables enable logging in gRPC. For |
| example, <code class="docutils literal notranslate"><span class="pre">env</span> <span class="pre">GRPC_VERBOSITY=info</span> <span class="pre">GRPC_TRACE=http</span></code> will print the initial |
| headers (on both sides) so you can see if gRPC established the connection or |
| not. It will also print when a message is sent, so you can tell if the |
| connection is open or not.</p> |
| <p>gRPC may not report connection errors until a call is actually made. |
| Hence, to detect connection errors when creating a client, some sort |
| of dummy RPC should be made.</p> |
| </section> |
| <section id="memory-management"> |
| <h3>Memory management<a class="headerlink" href="#memory-management" title="Permalink to this heading">¶</a></h3> |
| <p>Flight tries to reuse allocations made by gRPC to avoid redundant |
| data copies. However, this means that those allocations may not |
| be tracked by the Arrow memory pool, and that memory usage behavior, |
| such as whether free memory is returned to the system, is dependent |
| on the allocator that gRPC uses (usually the system allocator).</p> |
| <p>A quick way of testing: attach to the process with a debugger and call |
| <code class="docutils literal notranslate"><span class="pre">malloc_trim</span></code>, or call <a class="reference internal" href="api/memory.html#_CPPv4N5arrow10MemoryPool13ReleaseUnusedEv" title="arrow::MemoryPool::ReleaseUnused"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">ReleaseUnused</span></code></a> |
| on the system pool. If memory usage drops, then likely, there is memory |
| allocated by gRPC or by the application that the system allocator was holding |
| on to. This can be adjusted in platform-specific ways; see an investigation |
| in <a class="reference external" href="https://issues.apache.org/jira/browse/ARROW-16697">ARROW-16697</a> for an example of how this works on Linux/glibc. glibc malloc |
| can be explicitly told to dump caches.</p> |
| </section> |
| <section id="excessive-traffic"> |
| <h3>Excessive traffic<a class="headerlink" href="#excessive-traffic" title="Permalink to this heading">¶</a></h3> |
| <p>gRPC will spawn up to max threads quota of threads for concurrent clients. Those |
| threads are not necessarily cleaned up (a “cached thread pool” in Java parlance). |
| glibc malloc clears some per thread state and the default tuning never clears |
| caches in some workloads.</p> |
| <p>gRPC’s default behaviour allows one server to accept many connections from many |
| different clients, but if requests do a lot of work (as they may under Flight), |
| the server may not be able to keep up. Configuring clients to retry |
| with backoff (and potentially connect to a different node), would give more |
| consistent quality of service.</p> |
| <div class="sd-tab-set docutils"> |
| <input checked="checked" id="sd-tab-item-2" name="sd-tab-set-1" type="radio"> |
| </input><label class="sd-tab-label" for="sd-tab-item-2"> |
| C++</label><div class="sd-tab-content docutils"> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="k">auto</span><span class="w"> </span><span class="n">options</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">FlightClientOptions</span><span class="o">::</span><span class="n">Defaults</span><span class="p">();</span> |
| <span class="c1">// Set the minimum time between subsequent connection attempts.</span> |
| <span class="n">options</span><span class="p">.</span><span class="n">generic_options</span><span class="p">.</span><span class="n">emplace_back</span><span class="p">(</span><span class="n">GRPC_ARG_MIN_RECONNECT_BACKOFF_MS</span><span class="p">,</span><span class="w"> </span><span class="mi">2000</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| </div> |
| <input id="sd-tab-item-3" name="sd-tab-set-1" type="radio"> |
| </input><label class="sd-tab-label" for="sd-tab-item-3"> |
| Python</label><div class="sd-tab-content docutils"> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># Set the minimum time between subsequent connection attempts.</span> |
| <span class="n">generic_options</span> <span class="o">=</span> <span class="p">[(</span><span class="s2">"GRPC_ARG_MIN_RECONNECT_BACKOFF_MS"</span><span class="p">,</span> <span class="mi">2000</span><span class="p">)]</span> |
| <span class="n">client</span> <span class="o">=</span> <span class="n">pyarrow</span><span class="o">.</span><span class="n">flight</span><span class="o">.</span><span class="n">FlightClient</span><span class="p">(</span><span class="n">server_uri</span><span class="p">,</span> <span class="n">generic_options</span><span class="o">=</span><span class="n">generic_options</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| </section> |
| <section id="limiting-doput-batch-size"> |
| <h3>Limiting DoPut Batch Size<a class="headerlink" href="#limiting-doput-batch-size" title="Permalink to this heading">¶</a></h3> |
| <p>You may wish to limit the maximum batch size a client can submit to a server through |
| DoPut, to prevent a request from taking up too much memory on the server. On |
| the client-side, set <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight19FlightClientOptions22write_size_limit_bytesE" title="arrow::flight::FlightClientOptions::write_size_limit_bytes"><code class="xref cpp cpp-member docutils literal notranslate"><span class="pre">arrow::flight::FlightClientOptions::write_size_limit_bytes</span></code></a>. |
| On the server-side, set the gRPC option <code class="docutils literal notranslate"><span class="pre">GRPC_ARG_MAX_RECEIVE_MESSAGE_LENGTH</span></code>. |
| The client-side option will return an error that can be retried with smaller batches, |
| while the server-side limit will close out the connection. Setting both can be wise, since |
| the former provides a better user experience but the latter may be necessary to defend |
| against impolite clients.</p> |
| </section> |
| <section id="closing-unresponsive-connections"> |
| <h3>Closing unresponsive connections<a class="headerlink" href="#closing-unresponsive-connections" title="Permalink to this heading">¶</a></h3> |
| <ol class="arabic"> |
| <li><p>A stale call can be closed using |
| <a class="reference internal" href="api/flight.html#_CPPv4N5arrow6flight17FlightCallOptions10stop_tokenE" title="arrow::flight::FlightCallOptions::stop_token"><code class="xref cpp cpp-member docutils literal notranslate"><span class="pre">arrow::flight::FlightCallOptions::stop_token</span></code></a>. This requires recording the |
| stop token at call establishment time.</p> |
| <div class="sd-tab-set docutils"> |
| <input checked="checked" id="sd-tab-item-4" name="sd-tab-set-2" type="radio"> |
| </input><label class="sd-tab-label" for="sd-tab-item-4"> |
| C++</label><div class="sd-tab-content docutils"> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="n">StopSource</span><span class="w"> </span><span class="n">stop_source</span><span class="p">;</span> |
| <span class="n">FlightCallOptions</span><span class="w"> </span><span class="n">options</span><span class="p">;</span> |
| <span class="n">options</span><span class="p">.</span><span class="n">stop_token</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">stop_source</span><span class="p">.</span><span class="n">token</span><span class="p">();</span> |
| <span class="n">stop_source</span><span class="p">.</span><span class="n">RequestStop</span><span class="p">(</span><span class="n">Status</span><span class="o">::</span><span class="n">Cancelled</span><span class="p">(</span><span class="s">"StopSource"</span><span class="p">));</span> |
| <span class="n">flight_client</span><span class="o">-></span><span class="n">DoAction</span><span class="p">(</span><span class="n">options</span><span class="p">,</span><span class="w"> </span><span class="p">{});</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| </li> |
| <li><p>Use call timeouts. (This is a general gRPC best practice.)</p> |
| <div class="sd-tab-set docutils"> |
| <input checked="checked" id="sd-tab-item-5" name="sd-tab-set-3" type="radio"> |
| </input><label class="sd-tab-label" for="sd-tab-item-5"> |
| C++</label><div class="sd-tab-content docutils"> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="n">FlightCallOptions</span><span class="w"> </span><span class="n">options</span><span class="p">;</span> |
| <span class="n">options</span><span class="p">.</span><span class="n">timeout</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">TimeoutDuration</span><span class="p">{</span><span class="mf">0.2</span><span class="p">};</span> |
| <span class="n">Status</span><span class="w"> </span><span class="n">status</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">client</span><span class="o">-></span><span class="n">GetFlightInfo</span><span class="p">(</span><span class="n">options</span><span class="p">,</span><span class="w"> </span><span class="n">FlightDescriptor</span><span class="p">{}).</span><span class="n">status</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| </div> |
| <input id="sd-tab-item-6" name="sd-tab-set-3" type="radio"> |
| </input><label class="sd-tab-label" for="sd-tab-item-6"> |
| Java</label><div class="sd-tab-content docutils"> |
| <div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">Iterator</span><span class="o"><</span><span class="n">Result</span><span class="o">></span><span class="w"> </span><span class="n">results</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">client</span><span class="p">.</span><span class="na">doAction</span><span class="p">(</span><span class="k">new</span><span class="w"> </span><span class="n">Action</span><span class="p">(</span><span class="s">"hang"</span><span class="p">),</span><span class="w"> </span><span class="n">CallOptions</span><span class="p">.</span><span class="na">timeout</span><span class="p">(</span><span class="mf">0.2</span><span class="p">,</span><span class="w"> </span><span class="n">TimeUnit</span><span class="p">.</span><span class="na">SECONDS</span><span class="p">));</span> |
| </pre></div> |
| </div> |
| </div> |
| <input id="sd-tab-item-7" name="sd-tab-set-3" type="radio"> |
| </input><label class="sd-tab-label" for="sd-tab-item-7"> |
| Python</label><div class="sd-tab-content docutils"> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">options</span> <span class="o">=</span> <span class="n">pyarrow</span><span class="o">.</span><span class="n">flight</span><span class="o">.</span><span class="n">FlightCallOptions</span><span class="p">(</span><span class="n">timeout</span><span class="o">=</span><span class="mf">0.2</span><span class="p">)</span> |
| <span class="n">result</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">do_action</span><span class="p">(</span><span class="n">action</span><span class="p">,</span> <span class="n">options</span><span class="o">=</span><span class="n">options</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| </li> |
| <li><p>Client timeouts are not great for long-running streaming calls, where it may |
| be hard to choose a timeout for the entire operation. Instead, what is often |
| desired is a per-read or per-write timeout so that the operation fails if it |
| isn’t making progress. This can be implemented with a background thread that |
| calls Cancel() on a timer, with the main thread resetting the timer every time |
| an operation completes successfully. For a fully-worked out example, see the |
| Cookbook.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>There is a long standing ticket for a per-write/per-read timeout |
| instead of a per call timeout (<a class="reference external" href="https://issues.apache.org/jira/browse/ARROW-6062">ARROW-6062</a>), but this is not (easily) |
| possible to implement with the blocking gRPC API.</p> |
| </div> |
| </li> |
| </ol> |
| </section> |
| </section> |
| <section id="alternative-transports"> |
| <h2>Alternative Transports<a class="headerlink" href="#alternative-transports" title="Permalink to this heading">¶</a></h2> |
| <p>The standard transport for Arrow Flight is <a class="reference external" href="https://grpc.io/">gRPC</a>. The C++ |
| implementation also experimentally supports a transport based on |
| <a class="reference external" href="https://openucx.org/">UCX</a>. To use it, use the protocol scheme <code class="docutils literal notranslate"><span class="pre">ucx:</span></code> when starting a |
| server or creating a client.</p> |
| <section id="ucx-transport"> |
| <h3>UCX Transport<a class="headerlink" href="#ucx-transport" title="Permalink to this heading">¶</a></h3> |
| <p>Not all features of the gRPC transport are supported. See |
| <a class="reference internal" href="../status.html#status-flight-rpc"><span class="std std-ref">Flight RPC</span></a> for details. Also note these specific |
| caveats:</p> |
| <ul class="simple"> |
| <li><p>The server creates an independent UCP worker for each client. This |
| consumes more resources but provides better throughput.</p></li> |
| <li><p>The client creates an independent UCP worker for each RPC |
| call. Again, this trades off resource consumption for |
| performance. This also means that unlike with gRPC, it is |
| essentially equivalent to make all calls with a single client or |
| with multiple clients.</p></li> |
| <li><p>The UCX transport attempts to avoid copies where possible. In some |
| cases, it can directly reuse UCX-allocated buffers to back |
| <a class="reference internal" href="api/memory.html#_CPPv4N5arrow6BufferE" title="arrow::Buffer"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Buffer</span></code></a> objects, however, this will also extend the |
| lifetime of associated UCX resources beyond the lifetime of the |
| Flight client or server object.</p></li> |
| <li><p>Depending on the transport that UCX itself selects, you may find |
| that increasing <code class="docutils literal notranslate"><span class="pre">UCX_MM_SEG_SIZE</span></code> from the default (around 8KB) to |
| around 60KB improves performance (UCX will copy more data in a |
| single call).</p></li> |
| </ul> |
| </section> |
| </section> |
| </section> |
| |
| |
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