hddong commented on a change in pull request #25412: [SPARK-28691][EXAMPLES] Add Java/Scala DirectKerberizedKafkaWordCount examples URL: https://github.com/apache/spark/pull/25412#discussion_r316465282
########## File path: examples/src/main/java/org/apache/spark/examples/streaming/JavaDirectKerberizedKafkaWordCount.java ########## @@ -0,0 +1,138 @@ +/* + * 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.streaming; + +import java.util.HashMap; +import java.util.HashSet; +import java.util.Arrays; +import java.util.Map; +import java.util.Set; +import java.util.regex.Pattern; + +import scala.Tuple2; + +import org.apache.kafka.clients.CommonClientConfigs; +import org.apache.kafka.common.security.auth.SecurityProtocol; +import org.apache.kafka.clients.consumer.ConsumerConfig; +import org.apache.kafka.clients.consumer.ConsumerRecord; +import org.apache.kafka.common.serialization.StringDeserializer; + +import org.apache.spark.SparkConf; +import org.apache.spark.streaming.api.java.*; +import org.apache.spark.streaming.kafka010.ConsumerStrategies; +import org.apache.spark.streaming.kafka010.KafkaUtils; +import org.apache.spark.streaming.kafka010.LocationStrategies; +import org.apache.spark.streaming.Durations; + +/** + * Consumes messages from one or more topics in Kafka and does wordcount. + * Usage: JavaDirectKerberizedKafkaWordCount <brokers> <groupId> <topics> + * <brokers> is a list of one or more Kafka brokers + * <groupId> is a consumer group name to consume from topics + * <topics> is a list of one or more kafka topics to consume from + * + * 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 + * streaming.JavaDirectKerberizedKafkaWordCount broker1-host:port,broker2-host:port \ + * consumer-group 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" \ Review comment: @gaborgsomogyi , Client mode, driver run on client which usually has environment of kerberos, so it's not need. Cluster mode, driver run in a random executor which not contain krb5.conf and it will throw exception: ``` Caused by: javax.security.auth.login.LoginException: Cannot locate KDC at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:804) at com.sun.security.auth.module.Krb5LoginModule.login(Krb5LoginModule.java:617) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at javax.security.auth.login.LoginContext.invoke(LoginContext.java:755) at javax.security.auth.login.LoginContext.access$000(LoginContext.java:195) at javax.security.auth.login.LoginContext$4.run(LoginContext.java:682) at javax.security.auth.login.LoginContext$4.run(LoginContext.java:680) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680) at javax.security.auth.login.LoginContext.login(LoginContext.java:587) at org.apache.kafka.common.security.authenticator.AbstractLogin.login(AbstractLogin.java:60) at org.apache.kafka.common.security.kerberos.KerberosLogin.login(KerberosLogin.java:103) at org.apache.kafka.common.security.authenticator.LoginManager.<init>(LoginManager.java:64) at org.apache.kafka.common.security.authenticator.LoginManager.acquireLoginManager(LoginManager.java:114) at org.apache.kafka.common.network.SaslChannelBuilder.configure(SaslChannelBuilder.java:142) ... 26 more ``` so , `krb5.conf` needed for cluster mode. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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