How can I shut down Rserve gracefully?
I have tried many options both in Mac and in Ubuntu. I read the Rserve documentation
http://rforge.net/Rserve/doc.html
and that for the Rserve and RSclient packages:
http://cran.r-project.org/web/packages/RSclient/RSclient.pdf
http://cran.r-project.org/web/packages/Rserve/Rserve.pdf
I cannot figure out what is the correct workflow for opening/closing a connection within Rserve and for shutting down Rserve 'gracefully'.
For example, in Ubuntu, I installed R from source with the ./config --enable-R-shlib (following the Rserve documentation) and also added the 'control enable' line in /etc/Rserve.conf.
In an Ubuntu terminal:
library(Rserve)
library(RSclient)
Rserve()
c<-RS.connect()
c ## this is an Rserve QAP1 connection
## Trying to shutdown the server
RSshutdown(c)
Error in writeBin(as.integer....): invalid connection
RS.server.shutdown(c)
Error in RS.server.shutdown(c): command failed with satus code 0x4e: no control line present (control commands disabled or server shutdown)
I can, however, CLOSE the connection:
RS.close(c)
>NULL
c ## Closed Rserve connection
After closing the connection, I also tried the options (also tried with argument 'c', even though the connection is closed):
RS.server.shutdown()
RSshutdown()
So, my questions are:
1- How can I close Rserve gracefully?
2- Can Rserve be used without RSclient?
I also looked at
How to Shutdown Rserve(), running in DEBUG
but the question refers to the debug mode and is also unresolved. (I don't have enough reputation to comment/ask whether the shutdown works in the non-debug mode).
Also looked at:
how to connect to Rserve with an R client
Thanks so much!
Load Rserve and RSclient packages, then connect to the instances.
> library(Rserve)
> library(RSclient)
> Rserve(port = 6311, debug = FALSE)
> Rserve(port = 6312, debug = TRUE)
Starting Rserve...
"C:..Rserve.exe" --RS-port 6311
Starting Rserve...
"C:..Rserve_d.exe" --RS-port 6312
> rsc <- RSconnect(port = 6311)
> rscd <- RSconnect(port = 6312)
Looks like they're running...
> system('tasklist /FI "IMAGENAME eq Rserve.exe"')
> system('tasklist /FI "IMAGENAME eq Rserve_d.exe"')
Image Name PID Session Name Session# Mem Usage
========================= ======== ================ =========== ============
Rserve.exe 8600 Console 1 39,312 K
Rserve_d.exe 12652 Console 1 39,324 K
Let's shut 'em down.
> RSshutdown(rsc)
> RSshutdown(rscd)
And they're gone...
> system('tasklist /FI "IMAGENAME eq Rserve.exe"')
> system('tasklist /FI "IMAGENAME eq Rserve_d.exe"')
INFO: No tasks are running which match the specified criteria.
Rserve can be used w/o RSclient by starting it with args and/or a config script. Then you can connect to it from some other program (like Tableau) or with your own code. RSclient provides a way to pass commands/data to Rserve from an instance of R.
Hope this helps :)
On a Windows system, if you want to close an RServe instance, you can use the system function in R to close it down. For example in R :
library(Rserve)
Rserve() # run without any arguments or ports specified
system('tasklist /FI "IMAGENAME eq Rserve.exe"') # run this to see RServe instances and their PIDs
system('TASKKILL /PID {yourPID} /F') # run this to kill off the RServe instance with your selected PID
If you have closed your RServe instance with that PID correctly, the following message will appear:
SUCCESS: The process with PID xxxx has been terminated.
You can check the RServe instance has been closed down by entering
system('tasklist /FI "IMAGENAME eq Rserve.exe"')
again. If there are no RServe instances running any more, you will get the message
INFO: No tasks are running which match the specified criteria.
More help and info on this topic can be seen in this related question.
Note that the 'RSClient' approach mentioned in an earlier answer is tidier and easier than this one, but I put it forward anyway for those who start RServe without knowing how to stop it.
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