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| <p>This Apache Druid extension enables Druid to ingest and understand the Protobuf data format. Make sure to <a href="/docs/26.0.0/development/extensions.html#loading-extensions">include</a> <code>druid-protobuf-extensions</code> in the extensions load list.</p> |
| <p>The <code>druid-protobuf-extensions</code> provides the <a href="/docs/26.0.0/ingestion/data-formats.html#protobuf-parser">Protobuf Parser</a> |
| for <a href="/docs/26.0.0/ingestion/index.html#streaming">stream ingestion</a>. See corresponding docs for details.</p> |
| <h2><a class="anchor" aria-hidden="true" id="example-load-protobuf-messages-from-kafka"></a><a href="#example-load-protobuf-messages-from-kafka" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example: Load Protobuf messages from Kafka</h2> |
| <p>This example demonstrates how to load Protobuf messages from Kafka. Please read the <a href="/docs/26.0.0/tutorials/tutorial-kafka.html">Load from Kafka tutorial</a> first, and see <a href="/docs/26.0.0/development/extensions-core/kafka-ingestion.html">Kafka Indexing Service</a> documentation for more details.</p> |
| <p>The files used in this example are found at <a href="https://github.com/apache/druid/tree/master/examples/quickstart/protobuf"><code>./examples/quickstart/protobuf</code> in your Druid directory</a>.</p> |
| <p>For this example:</p> |
| <ul> |
| <li>Kafka broker host is <code>localhost:9092</code></li> |
| <li>Kafka topic is <code>metrics_pb</code></li> |
| <li>Datasource name is <code>metrics-protobuf</code></li> |
| </ul> |
| <p>Here is a JSON example of the 'metrics' data schema used in the example.</p> |
| <pre><code class="hljs css language-json">{ |
| <span class="hljs-attr">"unit"</span>: <span class="hljs-string">"milliseconds"</span>, |
| <span class="hljs-attr">"http_method"</span>: <span class="hljs-string">"GET"</span>, |
| <span class="hljs-attr">"value"</span>: <span class="hljs-number">44</span>, |
| <span class="hljs-attr">"timestamp"</span>: <span class="hljs-string">"2017-04-06T02:36:22Z"</span>, |
| <span class="hljs-attr">"http_code"</span>: <span class="hljs-string">"200"</span>, |
| <span class="hljs-attr">"page"</span>: <span class="hljs-string">"/"</span>, |
| <span class="hljs-attr">"metricType"</span>: <span class="hljs-string">"request/latency"</span>, |
| <span class="hljs-attr">"server"</span>: <span class="hljs-string">"www1.example.com"</span> |
| } |
| </code></pre> |
| <h3><a class="anchor" aria-hidden="true" id="proto-file"></a><a href="#proto-file" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Proto file</h3> |
| <p>The corresponding proto file for our 'metrics' dataset looks like this. You can use Protobuf <code>inputFormat</code> with a proto file or <a href="https://docs.confluent.io/platform/current/schema-registry/index.html">Confluent Schema Registry</a>.</p> |
| <pre><code class="hljs">syntax = <span class="hljs-string">"proto3"</span>; |
| message Metrics { |
| string unit = 1; |
| string http_method = 2; |
| int32 value = 3; |
| string timestamp = 4; |
| string http_code = 5; |
| string<span class="hljs-built_in"> page </span>= 6; |
| string metricType = 7; |
| string<span class="hljs-built_in"> server </span>= 8; |
| } |
| </code></pre> |
| <h3><a class="anchor" aria-hidden="true" id="when-using-a-descriptor-file"></a><a href="#when-using-a-descriptor-file" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>When using a descriptor file</h3> |
| <p>Next, we use the <code>protoc</code> Protobuf compiler to generate the descriptor file and save it as <code>metrics.desc</code>. The descriptor file must be either in the classpath or reachable by URL. In this example the descriptor file was saved at <code>/tmp/metrics.desc</code>, however this file is also available in the example files. From your Druid install directory:</p> |
| <pre><code class="hljs">protoc -o <span class="hljs-meta-keyword">/tmp/</span>metrics.desc .<span class="hljs-meta-keyword">/quickstart/</span>protobuf/metrics.proto |
| </code></pre> |
| <h3><a class="anchor" aria-hidden="true" id="when-using-schema-registry"></a><a href="#when-using-schema-registry" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>When using Schema Registry</h3> |
| <p>Make sure your Schema Registry version is later than 5.5. Next, we can post a schema to add it to the registry:</p> |
| <pre><code class="hljs"><span class="hljs-keyword">POST</span> <span class="hljs-string">/subjects/test/versions</span> HTTP/1.1 |
| <span class="hljs-attribute">Host</span>: schemaregistry.example1.com |
| <span class="hljs-attribute">Accept</span>: application/vnd.schemaregistry.v1+json, application/vnd.schemaregistry+json, application/json |
| |
| <span class="taggerscript">{ |
| "schemaType": "PROTOBUF", |
| "schema": "syntax = <span class="hljs-symbol">\"</span>proto3<span class="hljs-symbol">\"</span>;<span class="hljs-symbol">\n</span>message Metrics {<span class="hljs-symbol">\n</span> string unit = 1;<span class="hljs-symbol">\n</span> string http_method = 2;<span class="hljs-symbol">\n</span> int32 value = 3;<span class="hljs-symbol">\n</span> string timestamp = 4;<span class="hljs-symbol">\n</span> string http_code = 5;<span class="hljs-symbol">\n</span> string page = 6;<span class="hljs-symbol">\n</span> string metricType = 7;<span class="hljs-symbol">\n</span> string server = 8;<span class="hljs-symbol">\n</span>}<span class="hljs-symbol">\n</span>" |
| } |
| </span></code></pre> |
| <p>This feature uses Confluent's Protobuf provider which is not included in the Druid distribution and must be installed separately. You can fetch it and its dependencies from the Confluent repository and Maven Central at:</p> |
| <ul> |
| <li><a href="https://packages.confluent.io/maven/io/confluent/kafka-protobuf-provider/6.0.1/kafka-protobuf-provider-6.0.1.jar">https://packages.confluent.io/maven/io/confluent/kafka-protobuf-provider/6.0.1/kafka-protobuf-provider-6.0.1.jar</a></li> |
| <li><a href="https://repo1.maven.org/maven2/org/jetbrains/kotlin/kotlin-stdlib/1.4.0/kotlin-stdlib-1.4.0.jar">https://repo1.maven.org/maven2/org/jetbrains/kotlin/kotlin-stdlib/1.4.0/kotlin-stdlib-1.4.0.jar</a></li> |
| <li><a href="https://repo1.maven.org/maven2/com/squareup/wire/wire-schema/3.2.2/wire-schema-3.2.2.jar">https://repo1.maven.org/maven2/com/squareup/wire/wire-schema/3.2.2/wire-schema-3.2.2.jar</a></li> |
| </ul> |
| <p>Copy or symlink those files inside the folder <code>extensions/protobuf-extensions</code> under the distribution root directory.</p> |
| <h2><a class="anchor" aria-hidden="true" id="create-kafka-supervisor"></a><a href="#create-kafka-supervisor" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Create Kafka Supervisor</h2> |
| <p>Below is the complete Supervisor spec JSON to be submitted to the Overlord. |
| Make sure these keys are properly configured for successful ingestion.</p> |
| <h3><a class="anchor" aria-hidden="true" id="when-using-a-descriptor-file-1"></a><a href="#when-using-a-descriptor-file-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>When using a descriptor file</h3> |
| <p>Important supervisor properties</p> |
| <ul> |
| <li><code>protoBytesDecoder.descriptor</code> for the descriptor file URL</li> |
| <li><code>protoBytesDecoder.protoMessageType</code> from the proto definition</li> |
| <li><code>protoBytesDecoder.type</code> set to <code>file</code>, indicate use descriptor file to decode Protobuf file</li> |
| <li><code>inputFormat</code> should have <code>type</code> set to <code>protobuf</code></li> |
| </ul> |
| <pre><code class="hljs css language-json">{ |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kafka"</span>, |
| <span class="hljs-attr">"spec"</span>: { |
| <span class="hljs-attr">"dataSchema"</span>: { |
| <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"metrics-protobuf"</span>, |
| <span class="hljs-attr">"timestampSpec"</span>: { |
| <span class="hljs-attr">"column"</span>: <span class="hljs-string">"timestamp"</span>, |
| <span class="hljs-attr">"format"</span>: <span class="hljs-string">"auto"</span> |
| }, |
| <span class="hljs-attr">"dimensionsSpec"</span>: { |
| <span class="hljs-attr">"dimensions"</span>: [ |
| <span class="hljs-string">"unit"</span>, |
| <span class="hljs-string">"http_method"</span>, |
| <span class="hljs-string">"http_code"</span>, |
| <span class="hljs-string">"page"</span>, |
| <span class="hljs-string">"metricType"</span>, |
| <span class="hljs-string">"server"</span> |
| ], |
| <span class="hljs-attr">"dimensionExclusions"</span>: [ |
| <span class="hljs-string">"timestamp"</span>, |
| <span class="hljs-string">"value"</span> |
| ] |
| }, |
| <span class="hljs-attr">"metricsSpec"</span>: [ |
| { |
| <span class="hljs-attr">"name"</span>: <span class="hljs-string">"count"</span>, |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"count"</span> |
| }, |
| { |
| <span class="hljs-attr">"name"</span>: <span class="hljs-string">"value_sum"</span>, |
| <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>, |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleSum"</span> |
| }, |
| { |
| <span class="hljs-attr">"name"</span>: <span class="hljs-string">"value_min"</span>, |
| <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>, |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleMin"</span> |
| }, |
| { |
| <span class="hljs-attr">"name"</span>: <span class="hljs-string">"value_max"</span>, |
| <span class="hljs-attr">"fieldName"</span>: <span class="hljs-string">"value"</span>, |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"doubleMax"</span> |
| } |
| ], |
| <span class="hljs-attr">"granularitySpec"</span>: { |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"uniform"</span>, |
| <span class="hljs-attr">"segmentGranularity"</span>: <span class="hljs-string">"HOUR"</span>, |
| <span class="hljs-attr">"queryGranularity"</span>: <span class="hljs-string">"NONE"</span> |
| } |
| }, |
| <span class="hljs-attr">"tuningConfig"</span>: { |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kafka"</span>, |
| <span class="hljs-attr">"maxRowsPerSegment"</span>: <span class="hljs-number">5000000</span> |
| }, |
| <span class="hljs-attr">"ioConfig"</span>: { |
| <span class="hljs-attr">"topic"</span>: <span class="hljs-string">"metrics_pb"</span>, |
| <span class="hljs-attr">"consumerProperties"</span>: { |
| <span class="hljs-attr">"bootstrap.servers"</span>: <span class="hljs-string">"localhost:9092"</span> |
| }, |
| <span class="hljs-attr">"inputFormat"</span>: { |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"protobuf"</span>, |
| <span class="hljs-attr">"protoBytesDecoder"</span>: { |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"file"</span>, |
| <span class="hljs-attr">"descriptor"</span>: <span class="hljs-string">"file:///tmp/metrics.desc"</span>, |
| <span class="hljs-attr">"protoMessageType"</span>: <span class="hljs-string">"Metrics"</span> |
| }, |
| <span class="hljs-attr">"flattenSpec"</span>: { |
| <span class="hljs-attr">"useFieldDiscovery"</span>: <span class="hljs-literal">true</span> |
| }, |
| <span class="hljs-attr">"binaryAsString"</span>: <span class="hljs-literal">false</span> |
| }, |
| <span class="hljs-attr">"taskCount"</span>: <span class="hljs-number">1</span>, |
| <span class="hljs-attr">"replicas"</span>: <span class="hljs-number">1</span>, |
| <span class="hljs-attr">"taskDuration"</span>: <span class="hljs-string">"PT1H"</span>, |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"kafka"</span> |
| } |
| } |
| } |
| </code></pre> |
| <p>To adopt to old version. You can use old parser style, which also works.</p> |
| <pre><code class="hljs css language-json">{ |
| <span class="hljs-attr">"parser"</span>: { |
| <span class="hljs-attr">"type"</span>: <span class="hljs-string">"protobuf"</span>, |
| <span class="hljs-attr">"descriptor"</span>: <span class="hljs-string">"file:///tmp/metrics.desc"</span>, |
| <span class="hljs-attr">"protoMessageType"</span>: <span class="hljs-string">"Metrics"</span> |
| } |
| } |
| </code></pre> |
| <h3><a class="anchor" aria-hidden="true" id="when-using-schema-registry-1"></a><a href="#when-using-schema-registry-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>When using Schema Registry</h3> |
| <p>Important supervisor properties</p> |
| <ul> |
| <li><code>protoBytesDecoder.url</code> for the schema registry URL with single instance.</li> |
| <li><code>protoBytesDecoder.urls</code> for the schema registry URLs with multi instances.</li> |
| <li><code>protoBytesDecoder.capacity</code> capacity for schema registry cached schemas.</li> |
| <li><code>protoBytesDecoder.config</code> to send additional configurations, configured for Schema Registry.</li> |
| <li><code>protoBytesDecoder.headers</code> to send headers to the Schema Registry.</li> |
| <li><code>protoBytesDecoder.type</code> set to <code>schema_registry</code>, indicate use schema registry to decode Protobuf file.</li> |
| <li><code>parser</code> should have <code>type</code> set to <code>protobuf</code>, but note that the <code>format</code> of the <code>parseSpec</code> must be <code>json</code>.</li> |
| </ul> |
| <pre><code class="hljs css language-json">{ |
| "parser": { |
| "type": "protobuf", |
| "protoBytesDecoder": { |
| "urls": ["http://schemaregistry.example1.com:8081","http://schemaregistry.example2.com:8081"], |
| "type": "schema_registry", |
| "capacity": 100, |
| "config" : { |
| "basic.auth.credentials.source": "USER_INFO", |
| "basic.auth.user.info": "fred:letmein", |
| "schema.registry.ssl.truststore.location": "/some/secrets/kafka.client.truststore.jks", |
| "schema.registry.ssl.truststore.password": "<password>", |
| "schema.registry.ssl.keystore.location": "/some/secrets/kafka.client.keystore.jks", |
| "schema.registry.ssl.keystore.password": "<password>", |
| "schema.registry.ssl.key.password": "<password>", |
| ... |
| }, |
| "headers": { |
| "traceID" : "b29c5de2-0db4-490b-b421", |
| "timeStamp" : "1577191871865", |
| ... |
| } |
| } |
| } |
| } |
| </code></pre> |
| <h2><a class="anchor" aria-hidden="true" id="adding-protobuf-messages-to-kafka"></a><a href="#adding-protobuf-messages-to-kafka" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Adding Protobuf messages to Kafka</h2> |
| <p>If necessary, from your Kafka installation directory run the following command to create the Kafka topic</p> |
| <pre><code class="hljs"><span class="hljs-string">./bin/kafka-topics.sh</span> <span class="hljs-params">--create</span> <span class="hljs-params">--zookeeper</span> localhost<span class="hljs-function">:2181</span> <span class="hljs-params">--replication-factor</span> 1 <span class="hljs-params">--partitions</span> 1 <span class="hljs-params">--topic</span> metrics_pb |
| </code></pre> |
| <p>This example script requires <code>protobuf</code> and <code>kafka-python</code> modules. With the topic in place, messages can be inserted running the following command from your Druid installation directory</p> |
| <pre><code class="hljs">./bin/<span class="hljs-keyword">generate</span>-example-metrics | python /quickstart/protobuf/pb_publisher<span class="hljs-variable">.py</span> |
| </code></pre> |
| <p>You can confirm that data has been inserted to your Kafka topic using the following command from your Kafka installation directory</p> |
| <pre><code class="hljs"><span class="hljs-string">./bin/kafka-console-consumer</span> <span class="hljs-params">--zookeeper</span> localhost <span class="hljs-params">--topic</span> metrics_pb |
| </code></pre> |
| <p>which should print messages like this</p> |
| <pre><code class="hljs">millisecondsGETR"2017<span class="hljs-string">-04</span><span class="hljs-string">-06</span>T03:23:56Z*2002/list:request/latencyBwww1.example.com |
| </code></pre> |
| <p>If your supervisor created in the previous step is running, the indexing tasks should begin producing the messages and the data will soon be available for querying in Druid.</p> |
| <h2><a class="anchor" aria-hidden="true" id="generating-the-example-files"></a><a href="#generating-the-example-files" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Generating the example files</h2> |
| <p>The files provided in the example quickstart can be generated in the following manner starting with only <code>metrics.proto</code>.</p> |
| <h3><a class="anchor" aria-hidden="true" id="metricsdesc"></a><a href="#metricsdesc" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>metrics.desc</code></h3> |
| <p>The descriptor file is generated using <code>protoc</code> Protobuf compiler. Given a <code>.proto</code> file, a <code>.desc</code> file can be generated like so.</p> |
| <pre><code class="hljs"><span class="hljs-selector-tag">protoc</span> <span class="hljs-selector-tag">-o</span> <span class="hljs-selector-tag">metrics</span><span class="hljs-selector-class">.desc</span> <span class="hljs-selector-tag">metrics</span><span class="hljs-selector-class">.proto</span> |
| </code></pre> |
| <h3><a class="anchor" aria-hidden="true" id="metrics_pb2py"></a><a href="#metrics_pb2py" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>metrics_pb2.py</code></h3> |
| <p><code>metrics_pb2.py</code> is also generated with <code>protoc</code></p> |
| <pre><code class="hljs"> protoc -o metrics.<span class="hljs-keyword">desc</span> metrics.proto <span class="hljs-comment">--python_out=.</span> |
| </code></pre> |
| <h3><a class="anchor" aria-hidden="true" id="pb_publisherpy"></a><a href="#pb_publisherpy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>pb_publisher.py</code></h3> |
| <p>After <code>metrics_pb2.py</code> is generated, another script can be constructed to parse JSON data, convert it to Protobuf, and produce to a Kafka topic</p> |
| <pre><code class="hljs css language-python"><span class="hljs-comment">#!/usr/bin/env python</span> |
| |
| <span class="hljs-keyword">import</span> sys |
| <span class="hljs-keyword">import</span> json |
| |
| <span class="hljs-keyword">from</span> kafka <span class="hljs-keyword">import</span> KafkaProducer |
| <span class="hljs-keyword">from</span> metrics_pb2 <span class="hljs-keyword">import</span> Metrics |
| |
| |
| producer = KafkaProducer(bootstrap_servers=<span class="hljs-string">'localhost:9092'</span>) |
| topic = <span class="hljs-string">'metrics_pb'</span> |
| |
| <span class="hljs-keyword">for</span> row <span class="hljs-keyword">in</span> iter(sys.stdin): |
| d = json.loads(row) |
| metrics = Metrics() |
| <span class="hljs-keyword">for</span> k, v <span class="hljs-keyword">in</span> d.items(): |
| setattr(metrics, k, v) |
| pb = metrics.SerializeToString() |
| producer.send(topic, pb) |
| |
| producer.flush() |
| </code></pre> |
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