SparkR-Install
标签：too 下载 安装jdk context writing 磁盘 anti 1.5 products
1.下载R
https://cran.r-project.org/src/base/R-3/
1.2 环境变量配置：
1.3 测试安装：
2.下载Rtools33
https://cran.r-project.org/bin/windows/Rtools/
2.1 配置环境变量
2.2 测试：
3.安装RStudio
https://www.rstudio.com/products/rstudio/download/ 直接下一步即可安装
4.安装JDK并设置环境变量
4.1环境变量配置：
4.2测试：
5.下载Spark安装程序
5.1 URL: http://spark.apache.org/downloads.html
5.2解压到本地磁盘的对应目录
6.安装Spark并设置环境变量
7.测试SparkR
注意：如果发现了提示 WARN NativeCodeLader：Unable to load native-hadoop library for your platform.....using
builtin-java classes where applicable 需要安装本地的hadoop库
8.下载hadoop库并安装
http://hadoop.apache.org/releases.html
9.设置hadoop环境变量
10.重新测试SparkR
10.1 如果测试时候出现以下提示，需要修改log4j文件INFO为WARN，位于\spark\conf下
10.2 修改conf中的log4j文件：
10.3 重新运行SparkR
11.运行SprkR代码
在Spark2.0中增加了RSparkSql进行Sql查询
dataframe为数据框操作
data-manipulation为数据转化
ml为机器学习
11.1 使用crtl+ALT+鼠標左鍵 打开控制台在此文件夹下
11.2 执行spark-submit xxx.R文件即可
12.安装SparkR包
12.1 将spark安装目录下的R/lib中的SparkR文件拷贝到..\R-3.3.2\library中，注意是将整个Spark文件夹，而非里面每一个文件。
源文件夹：
目的文件夹：
12.2 在RStudio中打开SparkR文件并运行代码dataframe.R文件，采用Ctrl+Enter一行行执行即可
SparkR语言的dataframe.R源代码如下
#
# 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.
# library(SparkR) # Initialize SparkContext and SQLContext
sc <- sparkR.init(appName="SparkR-DataFrame-example")
sqlContext <- sparkRSQL.init(sc) # Create a simple local data.frame
localDF <- data.frame(name=c("John", "Smith", "Sarah"), age=c(19, 23, 18)) # Convert local data frame to a SparkR DataFrame
df <- createDataFrame(sqlContext, localDF) # Print its schema
printSchema(df)
# root
# |-- name: string (nullable = true)
# |-- age: double (nullable = true) # Create a DataFrame from a JSON file
path <- file.path(Sys.getenv("SPARK_HOME"), "examples/src/main/resources/people.json")
peopleDF <- read.json(sqlContext, path)
printSchema(peopleDF) # Register this DataFrame as a table.
registerTempTable(peopleDF, "people") # SQL statements can be run by using the sql methods provided by sqlContext
teenagers <- sql(sqlContext, "SELECT name FROM people WHERE age >= 13 AND age <= 19") # Call collect to get a local data.frame
teenagersLocalDF <- collect(teenagers) # Print the teenagers in our dataset
print(teenagersLocalDF) # Stop the SparkContext now
sparkR.stop()
13.Rsudio 运行结果
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