Predictive Hacks

How to get data from Hive to R

In order to connect R with Hive you have to work with the RJDBC and rJava libraries. Below, we provide a code snippet where we get data from mytbl table which is under the mydb database.


## check library paths, amd64/server (jvm) should be first

## add memory to the VM and options
options(java.parameters = "-Xmx8000m")

#start VM

# add classpath
for(l in list.files('/opt/hivejdbc/')){ .jaddClassPath(paste("/opt/hivejdbc/",l,sep=""))}
# check classpath

#load driver
drv <- JDBC("com.cloudera.hive.jdbc4.HS2Driver","/opt/hivejdbc/HiveJDBC4.jar", identifier.quote="`")

conn <- dbConnect(drv, "jdbc:hive2://URL", "username", "password")

# if you want to get the list of databases 
show_databases <- dbGetQuery(conn, "show databases")

# get data from mytbl which is under mydb database 
my_table <- dbGetQuery(conn, "select * from mydb.mytbl")

Share This Post

Share on facebook
Share on linkedin
Share on twitter
Share on email

Subscribe To Our Newsletter

Get updates and learn from the best

More To Explore

Photo by NordWood Themes on Unsplash

How To Manage Multiple Screen Sessions

Linux’s Screen lets you run terminal applications to a Server in the background even if you disconnect from the ssh connection.

python exception

Exceptions in Python

In this tutorial, we will provide you with an example of exception handling in Python. For simplicity, we will work