spark企业案例 代码
时间: 2023-07-23 20:34:42 浏览: 87
由于每个企业的具体实现细节和代码都有所不同,因此我无法提供所有企业案例的代码。但是,我可以为您提供几个基本的Spark示例代码,以帮助您开始使用Spark:
1. 读取文本文件并计算单词数量:
```scala
val textFile = spark.read.textFile("path/to/text/file")
val wordCounts = textFile.flatMap(line => line.split(" ")).groupByKey(identity).count()
wordCounts.show()
```
2. 读取CSV文件并计算平均值:
```scala
val csvFile = spark.read.format("csv").option("header", "true").load("path/to/csv/file")
val average = csvFile.select(avg("column_name"))
average.show()
```
3. 使用Spark Streaming读取Kafka消息并计算单词数量:
```scala
val ssc = new StreamingContext(sparkConf, Seconds(1))
val kafkaParams = Map[String, Object](
"bootstrap.servers" -> "localhost:9092",
"key.deserializer" -> classOf[StringDeserializer],
"value.deserializer" -> classOf[StringDeserializer],
"group.id" -> "group_id",
"auto.offset.reset" -> "latest",
"enable.auto.commit" -> (false: java.lang.Boolean)
)
val topics = Array("topic_name")
val stream = KafkaUtils.createDirectStream[String, String](
ssc,
PreferConsistent,
Subscribe[String, String](topics, kafkaParams)
)
val words = stream.flatMap(record => record.value().split(" "))
val wordCounts = words.map(word => (word, 1)).reduceByKey(_ + _)
wordCounts.print()
ssc.start()
ssc.awaitTermination()
```
这些示例代码可以帮助您了解如何使用Spark进行基本操作。对于更复杂的企业案例,您需要根据具体情况编写代码。
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