我在hadoop hdfs上存储了.csv文件，

hadoop dfs -ls /afs
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.

17/01/12 15:15:49 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Found 1 item
-rw-r--r--   2 hduser supergroup  203572404 2017-01-10 12:04 /afs/Accounts.csv

我想用sparkr把这个文件导入rstudio。
我尝试了以下命令：

sc<-sparkR.session(master = "spark://MasterNode:7077",appName = "SparkR",sparkHome = "/opt/spark")
sContext<- sparkRSQL.init(sc)
library(data.table)
library(dplyr)

df<- read.df(sContext, "hdfs://MasterNode:54310/afs/Accounts.csv")

出现以下错误：

> df<- read.df(sContext, "hdfs://MasterNode:54310/afs/Accounts.csv")
Error in handleErrors(returnStatus, conn) : 
  No status is returned. Java SparkR backend might have failed.
In addition: Warning message:
In writeBin(requestMessage, conn) : problem writing to connection

请帮助我导入accounts.csv文件到rstudio使用sparkr。