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[pulsar-flink] Implements a batch program on Pulsar topic by writing …
…Flink DataSet as Avro (apache#3205) Implements a batch program on Pulsar topic by writing Flink DataSet as Avro data Type
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74 changes: 74 additions & 0 deletions
74
...ava/org/apache/flink/batch/connectors/pulsar/example/FlinkPulsarBatchAvroSinkExample.java
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| /** | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
| package org.apache.flink.batch.connectors.pulsar.example; | ||
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| import org.apache.flink.api.common.io.OutputFormat; | ||
| import org.apache.flink.api.java.DataSet; | ||
| import org.apache.flink.api.java.ExecutionEnvironment; | ||
| import org.apache.flink.batch.connectors.pulsar.PulsarAvroOutputFormat; | ||
| import org.apache.flink.batch.connectors.pulsar.avro.generated.NasaMission; | ||
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| import java.util.Arrays; | ||
| import java.util.List; | ||
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| /** | ||
| * Implements a batch program on Pulsar topic by writing Flink DataSet as Avro. | ||
| */ | ||
| public class FlinkPulsarBatchAvroSinkExample { | ||
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| private static final List<NasaMission> nasaMissions = Arrays.asList( | ||
| NasaMission.newBuilder().setId(1).setName("Mercury program").setStartYear(1959).setEndYear(1963).build(), | ||
| NasaMission.newBuilder().setId(2).setName("Apollo program").setStartYear(1961).setEndYear(1972).build(), | ||
| NasaMission.newBuilder().setId(3).setName("Gemini program").setStartYear(1963).setEndYear(1966).build(), | ||
| NasaMission.newBuilder().setId(4).setName("Skylab").setStartYear(1973).setEndYear(1974).build(), | ||
| NasaMission.newBuilder().setId(5).setName("Apollo–Soyuz Test Project").setStartYear(1975).setEndYear(1975).build()); | ||
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| private static final String SERVICE_URL = "pulsar://127.0.0.1:6650"; | ||
| private static final String TOPIC_NAME = "my-flink-topic"; | ||
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| public static void main(String[] args) throws Exception { | ||
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| // set up the execution environment | ||
| final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment(); | ||
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| // create PulsarAvroOutputFormat instance | ||
| final OutputFormat<NasaMission> pulsarAvroOutputFormat = new PulsarAvroOutputFormat<>(SERVICE_URL, TOPIC_NAME); | ||
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| // create DataSet | ||
| DataSet<NasaMission> nasaMissionDS = env.fromCollection(nasaMissions); | ||
| // map nasa mission names to upper-case | ||
| nasaMissionDS.map(nasaMission -> new NasaMission( | ||
| nasaMission.getId(), | ||
| nasaMission.getName(), | ||
| nasaMission.getStartYear(), | ||
| nasaMission.getEndYear())) | ||
| // filter missions which started after 1970 | ||
| .filter(nasaMission -> nasaMission.getStartYear() > 1970) | ||
| // write batch data to Pulsar | ||
| .output(pulsarAvroOutputFormat); | ||
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| // set parallelism to write Pulsar in parallel (optional) | ||
| env.setParallelism(2); | ||
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| // execute program | ||
| env.execute("Flink - Pulsar Batch Avro"); | ||
| } | ||
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| } |
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10 changes: 10 additions & 0 deletions
10
examples/flink-consumer-source/src/main/resources/avro/NasaMission.avsc
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| {"namespace": "org.apache.flink.batch.connectors.pulsar.avro.generated", | ||
| "type": "record", | ||
| "name": "NasaMission", | ||
| "fields": [ | ||
| {"name": "id", "type": "int"}, | ||
| {"name": "name", "type": "string"}, | ||
| {"name": "start_year", "type": ["int", "null"]}, | ||
| {"name": "end_year", "type": ["int", "null"]} | ||
| ] | ||
| } |
72 changes: 72 additions & 0 deletions
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...g/apache/flink/batch/connectors/pulsar/example/FlinkPulsarBatchAvroSinkScalaExample.scala
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| /** | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
| package org.apache.flink.batch.connectors.pulsar.example | ||
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| import org.apache.flink.api.scala._ | ||
| import org.apache.flink.batch.connectors.pulsar.PulsarAvroOutputFormat | ||
| import org.apache.flink.batch.connectors.pulsar.avro.generated.NasaMission | ||
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| /** | ||
| * Implements a batch Scala program on Pulsar topic by writing Flink DataSet as Avro. | ||
| */ | ||
| object FlinkPulsarBatchAvroSinkScalaExample { | ||
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| private val SERVICE_URL = "pulsar://127.0.0.1:6650" | ||
| private val TOPIC_NAME = "my-flink-topic" | ||
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| val nasaMissions = List( | ||
| NasaMission.newBuilder.setId(1).setName("Mercury program").setStartYear(1959).setEndYear(1963).build, | ||
| NasaMission.newBuilder.setId(2).setName("Apollo program").setStartYear(1961).setEndYear(1972).build, | ||
| NasaMission.newBuilder.setId(3).setName("Gemini program").setStartYear(1963).setEndYear(1966).build, | ||
| NasaMission.newBuilder.setId(4).setName("Skylab").setStartYear(1973).setEndYear(1974).build, | ||
| NasaMission.newBuilder.setId(5).setName("Apollo–Soyuz Test Project").setStartYear(1975).setEndYear(1975).build) | ||
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| def main(args: Array[String]): Unit = { | ||
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| // set up the execution environment | ||
| val env = ExecutionEnvironment.getExecutionEnvironment | ||
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| // create PulsarCsvOutputFormat instance | ||
| val pulsarAvroOutputFormat = | ||
| new PulsarAvroOutputFormat[NasaMission](SERVICE_URL, TOPIC_NAME) | ||
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| // create DataSet | ||
| val textDS = env.fromCollection(nasaMissions) | ||
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| // map nasa mission names to upper-case | ||
| textDS.map(nasaMission => new NasaMission( | ||
| nasaMission.getId, | ||
| nasaMission.getName, | ||
| nasaMission.getStartYear, | ||
| nasaMission.getEndYear)) | ||
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| // filter missions which started after 1970 | ||
| .filter(_.getStartYear > 1970) | ||
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| // write batch data to Pulsar as Avro | ||
| .output(pulsarAvroOutputFormat) | ||
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| // set parallelism to write Pulsar in parallel (optional) | ||
| env.setParallelism(2) | ||
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| // execute program | ||
| env.execute("Flink - Pulsar Batch Avro") | ||
| } | ||
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| } |
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