r - 从配置单元执行 R 脚本

Question

有谁知道谁将数据从 hive 读取到 R 然后返回到 Hive？
我可以像这样使用 Python 轻松地做到这一点：

for line in sys.stdin:

  Some code ...

  sys.stdout.write(Output + '\n') 

R中有类似的方法吗？

谢谢汤姆

Answer 1

if you set up Rstudio on you hive server you can easily access it via R script. You would need the Rhive package. http://cran.r-project.org/web/packages/RHive/

All you need to do after that is set your paths for hadoop and hive home in your R profile and use

library(Rhive)
rhive.init()
rhcon<-rhive.connect(address,port=)

hope that helps!

Answer 2

Ofir，我想您可以在 R 中以某种方式编写代码。确切地说：

conn <- file("stdin", open="r")
while (length(next.line <- readLines(conn, n=1, warn=FALSE)) > 0) { 
    # processing
    cat(output)
}