hddong commented on a change in pull request #25649: [SPARK-28694][EXAMPLES]Add Java/Scala StructuredKerberizedKafkaWordCount examples URL: https://github.com/apache/spark/pull/25649#discussion_r320065744
########## File path: examples/src/main/java/org/apache/spark/examples/sql/streaming/JavaStructuredKerberiedKafkaWordCount.java ########## @@ -0,0 +1,129 @@ +/* + * 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.spark.examples.sql.streaming; + +import org.apache.kafka.common.security.auth.SecurityProtocol; +import org.apache.spark.api.java.function.FlatMapFunction; +import org.apache.spark.sql.Dataset; +import org.apache.spark.sql.Encoders; +import org.apache.spark.sql.Row; +import org.apache.spark.sql.SparkSession; +import org.apache.spark.sql.streaming.StreamingQuery; + +import java.util.Arrays; + +/** + * Consumes messages from one or more topics in Kafka and does wordcount. + * Usage: JavaStructuredKerberiedKafkaWordCount <bootstrap-servers> <subscribe-type> <topics> + * <bootstrap-servers> The Kafka "bootstrap.servers" configuration. A + * comma-separated list of host:port. + * <subscribe-type> There are three kinds of type, i.e. 'assign', 'subscribe', + * 'subscribePattern'. + * |- <assign> Specific TopicPartitions to consume. Json string + * | {"topicA":[0,1],"topicB":[2,4]}. + * |- <subscribe> The topic list to subscribe. A comma-separated list of + * | topics. + * |- <subscribePattern> The pattern used to subscribe to topic(s). + * | Java regex string. + * |- Only one of "assign, "subscribe" or "subscribePattern" options can be + * | specified for Kafka source. + * <topics> Different value format depends on the value of 'subscribe-type'. + * + * Example: + * Yarn client: + * $ bin/run-example --files ${jaas_path}/kafka_jaas.conf,${keytab_path}/kafka.service.keytab \ + * --driver-java-options "-Djava.security.auth.login.config=${path}/kafka_driver_jaas.conf" \ + * --conf \ + * "spark.executor.extraJavaOptions=-Djava.security.auth.login.config=./kafka_jaas.conf" \ + * --master yarn + * sql.streaming.JavaStructuredKerberiedKafkaWordCount broker1-host:port,broker2-host:port \ + * subscribe topic1,topic2 + * Yarn cluster: + * $ bin/run-example --files \ + * ${jaas_path}/kafka_jaas.conf,${keytab_path}/kafka.service.keytab,${krb5_path}/krb5.conf \ + * --driver-java-options \ + * "-Djava.security.auth.login.config=./kafka_jaas.conf \ + * -Djava.security.krb5.conf=./krb5.conf" \ + * --conf \ + * "spark.executor.extraJavaOptions=-Djava.security.auth.login.config=./kafka_jaas.conf" \ + * --master yarn --deploy-mode cluster \ + * sql.streaming.JavaStructuredKerberiedKafkaWordCount broker1-host:port,broker2-host:port \ + * subscribe topic1,topic2 + * + * kafka_jaas.conf can manually create, template as: + * KafkaClient { + * com.sun.security.auth.module.Krb5LoginModule required + * keyTab="./kafka.service.keytab" + * useKeyTab=true + * storeKey=true + * useTicketCache=false + * serviceName="kafka" + * principal="kafka/[email protected]"; + * }; + * kafka_driver_jaas.conf (used by yarn client) and kafka_jaas.conf are basically the same + * except for some differences at 'keyTab'. In kafka_driver_jaas.conf, 'keyTab' should be + * "${keytab_path}/kafka.service.keytab". + * In addition, for IBM JVMs, please use 'com.ibm.security.auth.module.Krb5LoginModule' + * instead of 'com.sun.security.auth.module.Krb5LoginModule'. + * + * Note that this example uses SASL_PLAINTEXT for simplicity; however, + * SASL_PLAINTEXT has no SSL encryption and likely be less secure. Please consider + * using SASL_SSL in production. + */ +public class JavaStructuredKerberiedKafkaWordCount { + public static void main(String[] args) throws Exception { + if (args.length < 3) { + System.err.println("Usage: JavaStructuredKerberiedKafkaWordCount <bootstrap-servers> " + + "<subscribe-type> <topics>"); + System.exit(1); + } + + String bootstrapServers = args[0]; + String subscribeType = args[1]; + String topics = args[2]; + + SparkSession spark = SparkSession + .builder() + .appName("JavaStructuredKerberiedKafkaWordCount") + .getOrCreate(); + + // Create DataSet representing the stream of input lines from kafka + Dataset<String> lines = spark + .readStream() + .format("kafka") + .option("kafka.bootstrap.servers", bootstrapServers) + .option(subscribeType, topics) + .option("kafka.security.protocol", SecurityProtocol.SASL_PLAINTEXT.name) + .load() + .selectExpr("CAST(value AS STRING)") + .as(Encoders.STRING()); + + // Generate running word count + Dataset<Row> wordCounts = lines.flatMap( + (FlatMapFunction<String, String>) x -> Arrays.asList(x.split(" ")).iterator(), Review comment: @gaborgsomogyi thanks, others have been fixed. 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