Github user ScrapCodes commented on a diff in the pull request: https://github.com/apache/spark/pull/17308#discussion_r110625538 --- Diff: external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/CachedKafkaProducer.scala --- @@ -0,0 +1,70 @@ +/* + * 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.sql.kafka010 + +import java.{util => ju} + +import scala.collection.mutable + +import org.apache.kafka.clients.producer.KafkaProducer + +import org.apache.spark.internal.Logging + +private[kafka010] object CachedKafkaProducer extends Logging { + + private val cacheMap = new mutable.HashMap[Int, KafkaProducer[Array[Byte], Array[Byte]]]() + + private def createKafkaProducer( + producerConfiguration: ju.HashMap[String, Object]): KafkaProducer[Array[Byte], Array[Byte]] = { + val kafkaProducer: KafkaProducer[Array[Byte], Array[Byte]] = + new KafkaProducer[Array[Byte], Array[Byte]](producerConfiguration) + cacheMap.put(producerConfiguration.hashCode(), kafkaProducer) --- End diff -- It is not a good idea to do like that. I had like my understanding to be corrected, as much as I understood. Since in this particular case Spark does not let user specify a key or value serializer/deserializer. So `Object` can be either a String, int or Long and for these hashcode would work correctly. I am also contemplating a better way to do it, now.
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