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| <div class="section" id="arrow-flight-rpc"> |
| <span id="flight-rpc"></span><h1>Arrow Flight RPC<a class="headerlink" href="#arrow-flight-rpc" title="Permalink to this headline">¶</a></h1> |
| <p>Arrow Flight is an RPC framework for high-performance data services |
| based on Arrow data, and is built on top of <a class="reference external" href="https://grpc.io/">gRPC</a> and the <a class="reference internal" href="IPC.html"><span class="doc">IPC |
| format</span></a>.</p> |
| <p>Flight is organized around streams of Arrow record batches, being |
| either downloaded from or uploaded to another service. A set of |
| metadata methods offers discovery and introspection of streams, as |
| well as the ability to implement application-specific methods.</p> |
| <p>Methods and message wire formats are defined by Protobuf, enabling |
| interoperability with clients that may support gRPC and Arrow |
| separately, but not Flight. However, Flight implementations include |
| further optimizations to avoid overhead in usage of Protobuf (mostly |
| around avoiding excessive memory copies).</p> |
| <div class="section" id="rpc-methods"> |
| <h2>RPC Methods<a class="headerlink" href="#rpc-methods" title="Permalink to this headline">¶</a></h2> |
| <p>Flight defines a set of RPC methods for uploading/downloading data, |
| retrieving metadata about a data stream, listing available data |
| streams, and for implementing application-specific RPC methods. A |
| Flight service implements some subset of these methods, while a Flight |
| client can call any of these methods. Thus, one Flight client can |
| connect to any Flight service and perform basic operations.</p> |
| <p>Data streams are identified by descriptors, which are either a path or |
| an arbitrary binary command. A client that wishes to download the data |
| would:</p> |
| <ol class="arabic"> |
| <li><p>Construct or acquire a <code class="docutils literal notranslate"><span class="pre">FlightDescriptor</span></code> for the data set they |
| are interested in. A client may know what descriptor they want |
| already, or they may use methods like <code class="docutils literal notranslate"><span class="pre">ListFlights</span></code> to discover |
| them.</p></li> |
| <li><p>Call <code class="docutils literal notranslate"><span class="pre">GetFlightInfo(FlightDescriptor)</span></code> to get a <code class="docutils literal notranslate"><span class="pre">FlightInfo</span></code> |
| message containing details on where the data is located (as well as |
| other metadata, like the schema and possibly an estimate of the |
| dataset size).</p> |
| <p>Flight does not require that data live on the same server as |
| metadata: this call may list other servers to connect to. The |
| <code class="docutils literal notranslate"><span class="pre">FlightInfo</span></code> message includes a <code class="docutils literal notranslate"><span class="pre">Ticket</span></code>, an opaque binary |
| token that the server uses to identify the exact data set being |
| requested.</p> |
| </li> |
| <li><p>Connect to other servers (if needed).</p></li> |
| <li><p>Call <code class="docutils literal notranslate"><span class="pre">DoGet(Ticket)</span></code> to get back a stream of Arrow record |
| batches.</p></li> |
| </ol> |
| <p>To upload data, a client would:</p> |
| <ol class="arabic simple"> |
| <li><p>Construct or acquire a <code class="docutils literal notranslate"><span class="pre">FlightDescriptor</span></code>, as before.</p></li> |
| <li><p>Call <code class="docutils literal notranslate"><span class="pre">DoPut(FlightData)</span></code> and upload a stream of Arrow record |
| batches. They would also include the <code class="docutils literal notranslate"><span class="pre">FlightDescriptor</span></code> with the |
| first message.</p></li> |
| </ol> |
| <p>See <a class="reference internal" href="#protocol-buffer-definitions">Protocol Buffer Definitions</a> for full details on the methods and |
| messages involved.</p> |
| </div> |
| <div class="section" id="authentication"> |
| <h2>Authentication<a class="headerlink" href="#authentication" title="Permalink to this headline">¶</a></h2> |
| <p>Flight supports application-implemented authentication |
| methods. Authentication, if enabled, has two phases: at connection |
| time, the client and server can exchange any number of messages. Then, |
| the client can provide a token alongside each call, and the server can |
| validate that token.</p> |
| <p>Applications may use any part of this; for instance, they may ignore |
| the initial handshake and send an externally acquired token on each |
| call, or they may establish trust during the handshake and not |
| validate a token for each call. (Note that the latter is not secure if |
| you choose to deploy a layer 7 load balancer, as is common with gRPC.)</p> |
| </div> |
| <div class="section" id="error-handling"> |
| <h2>Error Handling<a class="headerlink" href="#error-handling" title="Permalink to this headline">¶</a></h2> |
| <p>Arrow Flight defines its own set of error codes. The implementation |
| differs between languages (e.g. in C++, Unimplemented is a general |
| Arrow error status while it’s a Flight-specific exception in Java), |
| but the following set is exposed:</p> |
| <table class="table"> |
| <colgroup> |
| <col style="width: 27%" /> |
| <col style="width: 73%" /> |
| </colgroup> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Error Code</p></th> |
| <th class="head"><p>Description</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>UNKNOWN</p></td> |
| <td><p>An unknown error. The default if no other |
| error applies.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>INTERNAL</p></td> |
| <td><p>An error internal to the service |
| implementation occurred.</p></td> |
| </tr> |
| <tr class="row-even"><td><p>INVALID_ARGUMENT</p></td> |
| <td><p>The client passed an invalid argument to |
| the RPC.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>TIMED_OUT</p></td> |
| <td><p>The operation exceeded a timeout or |
| deadline.</p></td> |
| </tr> |
| <tr class="row-even"><td><p>NOT_FOUND</p></td> |
| <td><p>The requested resource (action, data |
| stream) was not found.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>ALREADY_EXISTS</p></td> |
| <td><p>The resource already exists.</p></td> |
| </tr> |
| <tr class="row-even"><td><p>CANCELLED</p></td> |
| <td><p>The operation was cancelled (either by the |
| client or the server).</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>UNAUTHENTICATED</p></td> |
| <td><p>The client is not authenticated.</p></td> |
| </tr> |
| <tr class="row-even"><td><p>UNAUTHORIZED</p></td> |
| <td><p>The client is authenticated, but does not |
| have permissions for the requested |
| operation.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>UNIMPLEMENTED</p></td> |
| <td><p>The RPC is not implemented.</p></td> |
| </tr> |
| <tr class="row-even"><td><p>UNAVAILABLE</p></td> |
| <td><p>The server is not available. May be emitted |
| by the client for connectivity reasons.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="external-resources"> |
| <h2>External Resources<a class="headerlink" href="#external-resources" title="Permalink to this headline">¶</a></h2> |
| <ul class="simple"> |
| <li><p><a class="reference external" href="https://arrow.apache.org/blog/2018/10/09/0.11.0-release/">https://arrow.apache.org/blog/2018/10/09/0.11.0-release/</a></p></li> |
| <li><p><a class="reference external" href="https://www.slideshare.net/JacquesNadeau5/apache-arrow-flight-overview">https://www.slideshare.net/JacquesNadeau5/apache-arrow-flight-overview</a></p></li> |
| </ul> |
| </div> |
| <div class="section" id="protocol-buffer-definitions"> |
| <h2>Protocol Buffer Definitions<a class="headerlink" href="#protocol-buffer-definitions" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-protobuf notranslate"><div class="highlight"><pre><span></span><span class="lineno"> 1 </span><span class="cm">/*</span> |
| <span class="lineno"> 2 </span><span class="cm"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="lineno"> 3 </span><span class="cm"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="lineno"> 4 </span><span class="cm"> * distributed with this work for additional information</span> |
| <span class="lineno"> 5 </span><span class="cm"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="lineno"> 6 </span><span class="cm"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="lineno"> 7 </span><span class="cm"> * "License"); you may not use this file except in compliance</span> |
| <span class="lineno"> 8 </span><span class="cm"> * with the License. You may obtain a copy of the License at</span> |
| <span class="lineno"> 9 </span><span class="cm"> * <p></span> |
| <span class="lineno"> 10 </span><span class="cm"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="lineno"> 11 </span><span class="cm"> * <p></span> |
| <span class="lineno"> 12 </span><span class="cm"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="lineno"> 13 </span><span class="cm"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="lineno"> 14 </span><span class="cm"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="lineno"> 15 </span><span class="cm"> * See the License for the specific language governing permissions and</span> |
| <span class="lineno"> 16 </span><span class="cm"> * limitations under the License.</span> |
| <span class="lineno"> 17 </span><span class="cm"> */</span> |
| <span class="lineno"> 18 </span> |
| <span class="lineno"> 19 </span><span class="na">syntax</span> <span class="o">=</span> <span class="s">"proto3"</span><span class="p">;</span> |
| <span class="lineno"> 20 </span> |
| <span class="lineno"> 21 </span><span class="k">option</span> <span class="na">java_package</span> <span class="o">=</span> <span class="s">"org.apache.arrow.flight.impl"</span><span class="p">;</span> |
| <span class="lineno"> 22 </span><span class="k">option</span> <span class="na">go_package</span> <span class="o">=</span> <span class="s">"github.com/apache/arrow/go/flight;flight"</span><span class="p">;</span> |
| <span class="lineno"> 23 </span><span class="k">option</span> <span class="na">csharp_namespace</span> <span class="o">=</span> <span class="s">"Apache.Arrow.Flight.Protocol"</span><span class="p">;</span> |
| <span class="lineno"> 24 </span> |
| <span class="lineno"> 25 </span><span class="kn">package</span> <span class="nn">arrow</span><span class="o">.</span><span class="n">flight.protocol</span><span class="p">;</span> |
| <span class="lineno"> 26 </span> |
| <span class="lineno"> 27 </span><span class="cm">/*</span> |
| <span class="lineno"> 28 </span><span class="cm"> * A flight service is an endpoint for retrieving or storing Arrow data. A</span> |
| <span class="lineno"> 29 </span><span class="cm"> * flight service can expose one or more predefined endpoints that can be</span> |
| <span class="lineno"> 30 </span><span class="cm"> * accessed using the Arrow Flight Protocol. Additionally, a flight service</span> |
| <span class="lineno"> 31 </span><span class="cm"> * can expose a set of actions that are available.</span> |
| <span class="lineno"> 32 </span><span class="cm"> */</span> |
| <span class="lineno"> 33 </span><span class="kd">service</span> <span class="n">FlightService</span> <span class="p">{</span> |
| <span class="lineno"> 34 </span> |
| <span class="lineno"> 35 </span> <span class="cm">/*</span> |
| <span class="lineno"> 36 </span><span class="cm"> * Handshake between client and server. Depending on the server, the</span> |
| <span class="lineno"> 37 </span><span class="cm"> * handshake may be required to determine the token that should be used for</span> |
| <span class="lineno"> 38 </span><span class="cm"> * future operations. Both request and response are streams to allow multiple</span> |
| <span class="lineno"> 39 </span><span class="cm"> * round-trips depending on auth mechanism.</span> |
| <span class="lineno"> 40 </span><span class="cm"> */</span> |
| <span class="lineno"> 41 </span> <span class="k">rpc</span> <span class="n">Handshake</span><span class="p">(</span><span class="n">stream</span> <span class="n">HandshakeRequest</span><span class="p">)</span> <span class="k">returns</span> <span class="p">(</span><span class="n">stream</span> <span class="n">HandshakeResponse</span><span class="p">)</span> <span class="p">{}</span> |
| <span class="lineno"> 42 </span> |
| <span class="lineno"> 43 </span> <span class="cm">/*</span> |
| <span class="lineno"> 44 </span><span class="cm"> * Get a list of available streams given a particular criteria. Most flight</span> |
| <span class="lineno"> 45 </span><span class="cm"> * services will expose one or more streams that are readily available for</span> |
| <span class="lineno"> 46 </span><span class="cm"> * retrieval. This api allows listing the streams available for</span> |
| <span class="lineno"> 47 </span><span class="cm"> * consumption. A user can also provide a criteria. The criteria can limit</span> |
| <span class="lineno"> 48 </span><span class="cm"> * the subset of streams that can be listed via this interface. Each flight</span> |
| <span class="lineno"> 49 </span><span class="cm"> * service allows its own definition of how to consume criteria.</span> |
| <span class="lineno"> 50 </span><span class="cm"> */</span> |
| <span class="lineno"> 51 </span> <span class="k">rpc</span> <span class="n">ListFlights</span><span class="p">(</span><span class="n">Criteria</span><span class="p">)</span> <span class="k">returns</span> <span class="p">(</span><span class="n">stream</span> <span class="n">FlightInfo</span><span class="p">)</span> <span class="p">{}</span> |
| <span class="lineno"> 52 </span> |
| <span class="lineno"> 53 </span> <span class="cm">/*</span> |
| <span class="lineno"> 54 </span><span class="cm"> * For a given FlightDescriptor, get information about how the flight can be</span> |
| <span class="lineno"> 55 </span><span class="cm"> * consumed. This is a useful interface if the consumer of the interface</span> |
| <span class="lineno"> 56 </span><span class="cm"> * already can identify the specific flight to consume. This interface can</span> |
| <span class="lineno"> 57 </span><span class="cm"> * also allow a consumer to generate a flight stream through a specified</span> |
| <span class="lineno"> 58 </span><span class="cm"> * descriptor. For example, a flight descriptor might be something that</span> |
| <span class="lineno"> 59 </span><span class="cm"> * includes a SQL statement or a Pickled Python operation that will be</span> |
| <span class="lineno"> 60 </span><span class="cm"> * executed. In those cases, the descriptor will not be previously available</span> |
| <span class="lineno"> 61 </span><span class="cm"> * within the list of available streams provided by ListFlights but will be</span> |
| <span class="lineno"> 62 </span><span class="cm"> * available for consumption for the duration defined by the specific flight</span> |
| <span class="lineno"> 63 </span><span class="cm"> * service.</span> |
| <span class="lineno"> 64 </span><span class="cm"> */</span> |
| <span class="lineno"> 65 </span> <span class="k">rpc</span> <span class="n">GetFlightInfo</span><span class="p">(</span><span class="n">FlightDescriptor</span><span class="p">)</span> <span class="k">returns</span> <span class="p">(</span><span class="n">FlightInfo</span><span class="p">)</span> <span class="p">{}</span> |
| <span class="lineno"> 66 </span> |
| <span class="lineno"> 67 </span> <span class="cm">/*</span> |
| <span class="lineno"> 68 </span><span class="cm"> * For a given FlightDescriptor, get the Schema as described in Schema.fbs::Schema</span> |
| <span class="lineno"> 69 </span><span class="cm"> * This is used when a consumer needs the Schema of flight stream. Similar to</span> |
| <span class="lineno"> 70 </span><span class="cm"> * GetFlightInfo this interface may generate a new flight that was not previously</span> |
| <span class="lineno"> 71 </span><span class="cm"> * available in ListFlights.</span> |
| <span class="lineno"> 72 </span><span class="cm"> */</span> |
| <span class="lineno"> 73 </span> <span class="k">rpc</span> <span class="n">GetSchema</span><span class="p">(</span><span class="n">FlightDescriptor</span><span class="p">)</span> <span class="k">returns</span> <span class="p">(</span><span class="n">SchemaResult</span><span class="p">)</span> <span class="p">{}</span> |
| <span class="lineno"> 74 </span> |
| <span class="lineno"> 75 </span> <span class="cm">/*</span> |
| <span class="lineno"> 76 </span><span class="cm"> * Retrieve a single stream associated with a particular descriptor</span> |
| <span class="lineno"> 77 </span><span class="cm"> * associated with the referenced ticket. A Flight can be composed of one or</span> |
| <span class="lineno"> 78 </span><span class="cm"> * more streams where each stream can be retrieved using a separate opaque</span> |
| <span class="lineno"> 79 </span><span class="cm"> * ticket that the flight service uses for managing a collection of streams.</span> |
| <span class="lineno"> 80 </span><span class="cm"> */</span> |
| <span class="lineno"> 81 </span> <span class="k">rpc</span> <span class="n">DoGet</span><span class="p">(</span><span class="n">Ticket</span><span class="p">)</span> <span class="k">returns</span> <span class="p">(</span><span class="n">stream</span> <span class="n">FlightData</span><span class="p">)</span> <span class="p">{}</span> |
| <span class="lineno"> 82 </span> |
| <span class="lineno"> 83 </span> <span class="cm">/*</span> |
| <span class="lineno"> 84 </span><span class="cm"> * Push a stream to the flight service associated with a particular</span> |
| <span class="lineno"> 85 </span><span class="cm"> * flight stream. This allows a client of a flight service to upload a stream</span> |
| <span class="lineno"> 86 </span><span class="cm"> * of data. Depending on the particular flight service, a client consumer</span> |
| <span class="lineno"> 87 </span><span class="cm"> * could be allowed to upload a single stream per descriptor or an unlimited</span> |
| <span class="lineno"> 88 </span><span class="cm"> * number. In the latter, the service might implement a 'seal' action that</span> |
| <span class="lineno"> 89 </span><span class="cm"> * can be applied to a descriptor once all streams are uploaded.</span> |
| <span class="lineno"> 90 </span><span class="cm"> */</span> |
| <span class="lineno"> 91 </span> <span class="k">rpc</span> <span class="n">DoPut</span><span class="p">(</span><span class="n">stream</span> <span class="n">FlightData</span><span class="p">)</span> <span class="k">returns</span> <span class="p">(</span><span class="n">stream</span> <span class="n">PutResult</span><span class="p">)</span> <span class="p">{}</span> |
| <span class="lineno"> 92 </span> |
| <span class="lineno"> 93 </span> <span class="cm">/*</span> |
| <span class="lineno"> 94 </span><span class="cm"> * Open a bidirectional data channel for a given descriptor. This</span> |
| <span class="lineno"> 95 </span><span class="cm"> * allows clients to send and receive arbitrary Arrow data and</span> |
| <span class="lineno"> 96 </span><span class="cm"> * application-specific metadata in a single logical stream. In</span> |
| <span class="lineno"> 97 </span><span class="cm"> * contrast to DoGet/DoPut, this is more suited for clients</span> |
| <span class="lineno"> 98 </span><span class="cm"> * offloading computation (rather than storage) to a Flight service.</span> |
| <span class="lineno"> 99 </span><span class="cm"> */</span> |
| <span class="lineno">100 </span> <span class="k">rpc</span> <span class="n">DoExchange</span><span class="p">(</span><span class="n">stream</span> <span class="n">FlightData</span><span class="p">)</span> <span class="k">returns</span> <span class="p">(</span><span class="n">stream</span> <span class="n">FlightData</span><span class="p">)</span> <span class="p">{}</span> |
| <span class="lineno">101 </span> |
| <span class="lineno">102 </span> <span class="cm">/*</span> |
| <span class="lineno">103 </span><span class="cm"> * Flight services can support an arbitrary number of simple actions in</span> |
| <span class="lineno">104 </span><span class="cm"> * addition to the possible ListFlights, GetFlightInfo, DoGet, DoPut</span> |
| <span class="lineno">105 </span><span class="cm"> * operations that are potentially available. DoAction allows a flight client</span> |
| <span class="lineno">106 </span><span class="cm"> * to do a specific action against a flight service. An action includes</span> |
| <span class="lineno">107 </span><span class="cm"> * opaque request and response objects that are specific to the type action</span> |
| <span class="lineno">108 </span><span class="cm"> * being undertaken.</span> |
| <span class="lineno">109 </span><span class="cm"> */</span> |
| <span class="lineno">110 </span> <span class="k">rpc</span> <span class="n">DoAction</span><span class="p">(</span><span class="n">Action</span><span class="p">)</span> <span class="k">returns</span> <span class="p">(</span><span class="n">stream</span> <span class="n">Result</span><span class="p">)</span> <span class="p">{}</span> |
| <span class="lineno">111 </span> |
| <span class="lineno">112 </span> <span class="cm">/*</span> |
| <span class="lineno">113 </span><span class="cm"> * A flight service exposes all of the available action types that it has</span> |
| <span class="lineno">114 </span><span class="cm"> * along with descriptions. This allows different flight consumers to</span> |
| <span class="lineno">115 </span><span class="cm"> * understand the capabilities of the flight service.</span> |
| <span class="lineno">116 </span><span class="cm"> */</span> |
| <span class="lineno">117 </span> <span class="k">rpc</span> <span class="n">ListActions</span><span class="p">(</span><span class="n">Empty</span><span class="p">)</span> <span class="k">returns</span> <span class="p">(</span><span class="n">stream</span> <span class="n">ActionType</span><span class="p">)</span> <span class="p">{}</span> |
| <span class="lineno">118 </span> |
| <span class="lineno">119 </span><span class="p">}</span> |
| <span class="lineno">120 </span> |
| <span class="lineno">121 </span><span class="cm">/*</span> |
| <span class="lineno">122 </span><span class="cm"> * The request that a client provides to a server on handshake.</span> |
| <span class="lineno">123 </span><span class="cm"> */</span> |
| <span class="lineno">124 </span><span class="kd">message</span> <span class="nc">HandshakeRequest</span> <span class="p">{</span> |
| <span class="lineno">125 </span> |
| <span class="lineno">126 </span> <span class="cm">/*</span> |
| <span class="lineno">127 </span><span class="cm"> * A defined protocol version</span> |
| <span class="lineno">128 </span><span class="cm"> */</span> |
| <span class="lineno">129 </span> <span class="kt">uint64</span> <span class="na">protocol_version</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">130 </span> |
| <span class="lineno">131 </span> <span class="cm">/*</span> |
| <span class="lineno">132 </span><span class="cm"> * Arbitrary auth/handshake info.</span> |
| <span class="lineno">133 </span><span class="cm"> */</span> |
| <span class="lineno">134 </span> <span class="kt">bytes</span> <span class="na">payload</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> |
| <span class="lineno">135 </span><span class="p">}</span> |
| <span class="lineno">136 </span> |
| <span class="lineno">137 </span><span class="kd">message</span> <span class="nc">HandshakeResponse</span> <span class="p">{</span> |
| <span class="lineno">138 </span> |
| <span class="lineno">139 </span> <span class="cm">/*</span> |
| <span class="lineno">140 </span><span class="cm"> * A defined protocol version</span> |
| <span class="lineno">141 </span><span class="cm"> */</span> |
| <span class="lineno">142 </span> <span class="kt">uint64</span> <span class="na">protocol_version</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">143 </span> |
| <span class="lineno">144 </span> <span class="cm">/*</span> |
| <span class="lineno">145 </span><span class="cm"> * Arbitrary auth/handshake info.</span> |
| <span class="lineno">146 </span><span class="cm"> */</span> |
| <span class="lineno">147 </span> <span class="kt">bytes</span> <span class="na">payload</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> |
| <span class="lineno">148 </span><span class="p">}</span> |
| <span class="lineno">149 </span> |
| <span class="lineno">150 </span><span class="cm">/*</span> |
| <span class="lineno">151 </span><span class="cm"> * A message for doing simple auth.</span> |
| <span class="lineno">152 </span><span class="cm"> */</span> |
| <span class="lineno">153 </span><span class="kd">message</span> <span class="nc">BasicAuth</span> <span class="p">{</span> |
| <span class="lineno">154 </span> <span class="kt">string</span> <span class="na">username</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> |
| <span class="lineno">155 </span> <span class="kt">string</span> <span class="na">password</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> |
| <span class="lineno">156 </span><span class="p">}</span> |
| <span class="lineno">157 </span> |
| <span class="lineno">158 </span><span class="kd">message</span> <span class="nc">Empty</span> <span class="p">{}</span> |
| <span class="lineno">159 </span> |
| <span class="lineno">160 </span><span class="cm">/*</span> |
| <span class="lineno">161 </span><span class="cm"> * Describes an available action, including both the name used for execution</span> |
| <span class="lineno">162 </span><span class="cm"> * along with a short description of the purpose of the action.</span> |
| <span class="lineno">163 </span><span class="cm"> */</span> |
| <span class="lineno">164 </span><span class="kd">message</span> <span class="nc">ActionType</span> <span class="p">{</span> |
| <span class="lineno">165 </span> <span class="kt">string</span> <span class="na">type</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">166 </span> <span class="kt">string</span> <span class="na">description</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> |
| <span class="lineno">167 </span><span class="p">}</span> |
| <span class="lineno">168 </span> |
| <span class="lineno">169 </span><span class="cm">/*</span> |
| <span class="lineno">170 </span><span class="cm"> * A service specific expression that can be used to return a limited set</span> |
| <span class="lineno">171 </span><span class="cm"> * of available Arrow Flight streams.</span> |
| <span class="lineno">172 </span><span class="cm"> */</span> |
| <span class="lineno">173 </span><span class="kd">message</span> <span class="nc">Criteria</span> <span class="p">{</span> |
| <span class="lineno">174 </span> <span class="kt">bytes</span> <span class="na">expression</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">175 </span><span class="p">}</span> |
| <span class="lineno">176 </span> |
| <span class="lineno">177 </span><span class="cm">/*</span> |
| <span class="lineno">178 </span><span class="cm"> * An opaque action specific for the service.</span> |
| <span class="lineno">179 </span><span class="cm"> */</span> |
| <span class="lineno">180 </span><span class="kd">message</span> <span class="nc">Action</span> <span class="p">{</span> |
| <span class="lineno">181 </span> <span class="kt">string</span> <span class="na">type</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">182 </span> <span class="kt">bytes</span> <span class="na">body</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> |
| <span class="lineno">183 </span><span class="p">}</span> |
| <span class="lineno">184 </span> |
| <span class="lineno">185 </span><span class="cm">/*</span> |
| <span class="lineno">186 </span><span class="cm"> * An opaque result returned after executing an action.</span> |
| <span class="lineno">187 </span><span class="cm"> */</span> |
| <span class="lineno">188 </span><span class="kd">message</span> <span class="nc">Result</span> <span class="p">{</span> |
| <span class="lineno">189 </span> <span class="kt">bytes</span> <span class="na">body</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">190 </span><span class="p">}</span> |
| <span class="lineno">191 </span> |
| <span class="lineno">192 </span><span class="cm">/*</span> |
| <span class="lineno">193 </span><span class="cm"> * Wrap the result of a getSchema call</span> |
| <span class="lineno">194 </span><span class="cm"> */</span> |
| <span class="lineno">195 </span><span class="kd">message</span> <span class="nc">SchemaResult</span> <span class="p">{</span> |
| <span class="lineno">196 </span> <span class="c1">// The schema of the dataset in its IPC form:</span> |
| <span class="lineno">197 </span> <span class="c1">// 4 bytes - an optional IPC_CONTINUATION_TOKEN prefix</span> |
| <span class="lineno">198 </span> <span class="c1">// 4 bytes - the byte length of the payload</span> |
| <span class="lineno">199 </span> <span class="c1">// a flatbuffer Message whose header is the Schema</span> |
| <span class="lineno">200 </span> <span class="kt">bytes</span> <span class="na">schema</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">201 </span><span class="p">}</span> |
| <span class="lineno">202 </span> |
| <span class="lineno">203 </span><span class="cm">/*</span> |
| <span class="lineno">204 </span><span class="cm"> * The name or tag for a Flight. May be used as a way to retrieve or generate</span> |
| <span class="lineno">205 </span><span class="cm"> * a flight or be used to expose a set of previously defined flights.</span> |
| <span class="lineno">206 </span><span class="cm"> */</span> |
| <span class="lineno">207 </span><span class="kd">message</span> <span class="nc">FlightDescriptor</span> <span class="p">{</span> |
| <span class="lineno">208 </span> |
| <span class="lineno">209 </span> <span class="cm">/*</span> |
| <span class="lineno">210 </span><span class="cm"> * Describes what type of descriptor is defined.</span> |
| <span class="lineno">211 </span><span class="cm"> */</span> |
| <span class="lineno">212 </span> <span class="kd">enum</span> <span class="n">DescriptorType</span> <span class="p">{</span> |
| <span class="lineno">213 </span> |
| <span class="lineno">214 </span> <span class="c1">// Protobuf pattern, not used.</span> |
| <span class="lineno">215 </span> <span class="na">UNKNOWN</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> |
| <span class="lineno">216 </span> |
| <span class="lineno">217 </span> <span class="cm">/*</span> |
| <span class="lineno">218 </span><span class="cm"> * A named path that identifies a dataset. A path is composed of a string</span> |
| <span class="lineno">219 </span><span class="cm"> * or list of strings describing a particular dataset. This is conceptually</span> |
| <span class="lineno">220 </span><span class="cm"> * similar to a path inside a filesystem.</span> |
| <span class="lineno">221 </span><span class="cm"> */</span> |
| <span class="lineno">222 </span> <span class="na">PATH</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">223 </span> |
| <span class="lineno">224 </span> <span class="cm">/*</span> |
| <span class="lineno">225 </span><span class="cm"> * An opaque command to generate a dataset.</span> |
| <span class="lineno">226 </span><span class="cm"> */</span> |
| <span class="lineno">227 </span> <span class="na">CMD</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> |
| <span class="lineno">228 </span> <span class="p">}</span> |
| <span class="lineno">229 </span> |
| <span class="lineno">230 </span> <span class="n">DescriptorType</span> <span class="na">type</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">231 </span> |
| <span class="lineno">232 </span> <span class="cm">/*</span> |
| <span class="lineno">233 </span><span class="cm"> * Opaque value used to express a command. Should only be defined when</span> |
| <span class="lineno">234 </span><span class="cm"> * type = CMD.</span> |
| <span class="lineno">235 </span><span class="cm"> */</span> |
| <span class="lineno">236 </span> <span class="kt">bytes</span> <span class="na">cmd</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> |
| <span class="lineno">237 </span> |
| <span class="lineno">238 </span> <span class="cm">/*</span> |
| <span class="lineno">239 </span><span class="cm"> * List of strings identifying a particular dataset. Should only be defined</span> |
| <span class="lineno">240 </span><span class="cm"> * when type = PATH.</span> |
| <span class="lineno">241 </span><span class="cm"> */</span> |
| <span class="lineno">242 </span> <span class="k">repeated</span> <span class="kt">string</span> <span class="na">path</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> |
| <span class="lineno">243 </span><span class="p">}</span> |
| <span class="lineno">244 </span> |
| <span class="lineno">245 </span><span class="cm">/*</span> |
| <span class="lineno">246 </span><span class="cm"> * The access coordinates for retrieval of a dataset. With a FlightInfo, a</span> |
| <span class="lineno">247 </span><span class="cm"> * consumer is able to determine how to retrieve a dataset.</span> |
| <span class="lineno">248 </span><span class="cm"> */</span> |
| <span class="lineno">249 </span><span class="kd">message</span> <span class="nc">FlightInfo</span> <span class="p">{</span> |
| <span class="lineno">250 </span> <span class="c1">// The schema of the dataset in its IPC form:</span> |
| <span class="lineno">251 </span> <span class="c1">// 4 bytes - an optional IPC_CONTINUATION_TOKEN prefix</span> |
| <span class="lineno">252 </span> <span class="c1">// 4 bytes - the byte length of the payload</span> |
| <span class="lineno">253 </span> <span class="c1">// a flatbuffer Message whose header is the Schema</span> |
| <span class="lineno">254 </span> <span class="kt">bytes</span> <span class="na">schema</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">255 </span> |
| <span class="lineno">256 </span> <span class="cm">/*</span> |
| <span class="lineno">257 </span><span class="cm"> * The descriptor associated with this info.</span> |
| <span class="lineno">258 </span><span class="cm"> */</span> |
| <span class="lineno">259 </span> <span class="n">FlightDescriptor</span> <span class="na">flight_descriptor</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> |
| <span class="lineno">260 </span> |
| <span class="lineno">261 </span> <span class="cm">/*</span> |
| <span class="lineno">262 </span><span class="cm"> * A list of endpoints associated with the flight. To consume the whole</span> |
| <span class="lineno">263 </span><span class="cm"> * flight, all endpoints must be consumed.</span> |
| <span class="lineno">264 </span><span class="cm"> */</span> |
| <span class="lineno">265 </span> <span class="k">repeated</span> <span class="n">FlightEndpoint</span> <span class="na">endpoint</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> |
| <span class="lineno">266 </span> |
| <span class="lineno">267 </span> <span class="c1">// Set these to -1 if unknown.</span> |
| <span class="lineno">268 </span> <span class="kt">int64</span> <span class="na">total_records</span> <span class="o">=</span> <span class="mi">4</span><span class="p">;</span> |
| <span class="lineno">269 </span> <span class="kt">int64</span> <span class="na">total_bytes</span> <span class="o">=</span> <span class="mi">5</span><span class="p">;</span> |
| <span class="lineno">270 </span><span class="p">}</span> |
| <span class="lineno">271 </span> |
| <span class="lineno">272 </span><span class="cm">/*</span> |
| <span class="lineno">273 </span><span class="cm"> * A particular stream or split associated with a flight.</span> |
| <span class="lineno">274 </span><span class="cm"> */</span> |
| <span class="lineno">275 </span><span class="kd">message</span> <span class="nc">FlightEndpoint</span> <span class="p">{</span> |
| <span class="lineno">276 </span> |
| <span class="lineno">277 </span> <span class="cm">/*</span> |
| <span class="lineno">278 </span><span class="cm"> * Token used to retrieve this stream.</span> |
| <span class="lineno">279 </span><span class="cm"> */</span> |
| <span class="lineno">280 </span> <span class="n">Ticket</span> <span class="na">ticket</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">281 </span> |
| <span class="lineno">282 </span> <span class="cm">/*</span> |
| <span class="lineno">283 </span><span class="cm"> * A list of URIs where this ticket can be redeemed. If the list is</span> |
| <span class="lineno">284 </span><span class="cm"> * empty, the expectation is that the ticket can only be redeemed on the</span> |
| <span class="lineno">285 </span><span class="cm"> * current service where the ticket was generated.</span> |
| <span class="lineno">286 </span><span class="cm"> */</span> |
| <span class="lineno">287 </span> <span class="k">repeated</span> <span class="n">Location</span> <span class="na">location</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> |
| <span class="lineno">288 </span><span class="p">}</span> |
| <span class="lineno">289 </span> |
| <span class="lineno">290 </span><span class="cm">/*</span> |
| <span class="lineno">291 </span><span class="cm"> * A location where a Flight service will accept retrieval of a particular</span> |
| <span class="lineno">292 </span><span class="cm"> * stream given a ticket.</span> |
| <span class="lineno">293 </span><span class="cm"> */</span> |
| <span class="lineno">294 </span><span class="kd">message</span> <span class="nc">Location</span> <span class="p">{</span> |
| <span class="lineno">295 </span> <span class="kt">string</span> <span class="na">uri</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">296 </span><span class="p">}</span> |
| <span class="lineno">297 </span> |
| <span class="lineno">298 </span><span class="cm">/*</span> |
| <span class="lineno">299 </span><span class="cm"> * An opaque identifier that the service can use to retrieve a particular</span> |
| <span class="lineno">300 </span><span class="cm"> * portion of a stream.</span> |
| <span class="lineno">301 </span><span class="cm"> */</span> |
| <span class="lineno">302 </span><span class="kd">message</span> <span class="nc">Ticket</span> <span class="p">{</span> |
| <span class="lineno">303 </span> <span class="kt">bytes</span> <span class="na">ticket</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">304 </span><span class="p">}</span> |
| <span class="lineno">305 </span> |
| <span class="lineno">306 </span><span class="cm">/*</span> |
| <span class="lineno">307 </span><span class="cm"> * A batch of Arrow data as part of a stream of batches.</span> |
| <span class="lineno">308 </span><span class="cm"> */</span> |
| <span class="lineno">309 </span><span class="kd">message</span> <span class="nc">FlightData</span> <span class="p">{</span> |
| <span class="lineno">310 </span> |
| <span class="lineno">311 </span> <span class="cm">/*</span> |
| <span class="lineno">312 </span><span class="cm"> * The descriptor of the data. This is only relevant when a client is</span> |
| <span class="lineno">313 </span><span class="cm"> * starting a new DoPut stream.</span> |
| <span class="lineno">314 </span><span class="cm"> */</span> |
| <span class="lineno">315 </span> <span class="n">FlightDescriptor</span> <span class="na">flight_descriptor</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">316 </span> |
| <span class="lineno">317 </span> <span class="cm">/*</span> |
| <span class="lineno">318 </span><span class="cm"> * Header for message data as described in Message.fbs::Message.</span> |
| <span class="lineno">319 </span><span class="cm"> */</span> |
| <span class="lineno">320 </span> <span class="kt">bytes</span> <span class="na">data_header</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> |
| <span class="lineno">321 </span> |
| <span class="lineno">322 </span> <span class="cm">/*</span> |
| <span class="lineno">323 </span><span class="cm"> * Application-defined metadata.</span> |
| <span class="lineno">324 </span><span class="cm"> */</span> |
| <span class="lineno">325 </span> <span class="kt">bytes</span> <span class="na">app_metadata</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> |
| <span class="lineno">326 </span> |
| <span class="lineno">327 </span> <span class="cm">/*</span> |
| <span class="lineno">328 </span><span class="cm"> * The actual batch of Arrow data. Preferably handled with minimal-copies</span> |
| <span class="lineno">329 </span><span class="cm"> * coming last in the definition to help with sidecar patterns (it is</span> |
| <span class="lineno">330 </span><span class="cm"> * expected that some implementations will fetch this field off the wire</span> |
| <span class="lineno">331 </span><span class="cm"> * with specialized code to avoid extra memory copies).</span> |
| <span class="lineno">332 </span><span class="cm"> */</span> |
| <span class="lineno">333 </span> <span class="kt">bytes</span> <span class="na">data_body</span> <span class="o">=</span> <span class="mi">1000</span><span class="p">;</span> |
| <span class="lineno">334 </span><span class="p">}</span> |
| <span class="lineno">335 </span> |
| <span class="lineno">336 </span><span class="cm">/**</span> |
| <span class="lineno">337 </span><span class="cm"> * The response message associated with the submission of a DoPut.</span> |
| <span class="lineno">338 </span><span class="cm"> */</span> |
| <span class="lineno">339 </span><span class="kd">message</span> <span class="nc">PutResult</span> <span class="p">{</span> |
| <span class="lineno">340 </span> <span class="kt">bytes</span> <span class="na">app_metadata</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> |
| <span class="lineno">341 </span><span class="p">}</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
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