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如何从spark中调用包来利用R进行数据操作?SparkR和软件包
例子中,我试图访问我的HDFS test.csv如下
Sys.setenv(SPARK_HOME="/opt/spark14")
library(SparkR)
sc <- sparkR.init(master="local")
sqlContext <- sparkRSQL.init(sc)
flights <- read.df(sqlContext,"hdfs://sandbox.hortonWorks.com:8020 /user/root/test.csv","com.databricks.spark.csv", header="true")
,但得到如下错误:
Caused by: java.lang.RuntimeException: Failed to load class for data source: com.databricks.spark.csv
我试图通过以下选项
加载CSV包Sys.setenv('SPARKR_SUBMIT_ARGS'='--packages com.databricks:spark-csv_2.10:1.0.3')
但加载sqlContext时出现以下错误
Launching java with spark-submit command /opt/spark14/bin/spark-submit --packages com.databricks:spark-csv_2.10:1.0.3 /tmp/RtmpuvwOky /backend_port95332e5267b
Error: Cannot load main class from JAR file:/tmp/RtmpuvwOky/backend_port95332e5267b
任何帮助将不胜感激。
Thanks Holden.I正在尝试使用Rstudio.I试图识别与两个选项关联的语法,即向SPARKR_SUBMIT_ARGS中添加spark-shell并运行--packages命令。这些语法? – san71
设置SPARKR_SUBMIT_ARGS的正确方法是做类似'Sys.setenv(SPARKR_SUBMIT_ARGS =“ - packages com.databricks:spark-csv_2.10:1.0.3 sparkr-shell”)''。我有一个公共关系公开将其添加到官方文档https://github.com/apache/spark/pull/6916 –
谢谢Shivaram.This工程! – san71