SAP HANA R Integration Guide

5 Debugging and Tracing
There are several methods for debugging and tracing in R with SAP HANA. This section provides information
for using these features.
5.1 Debugging R Procedures by Tracing R Script Output
One method to debug R procedures is to print out some traces in R scripts and then have users check the
printed result. SAP HANA R integration supports recording R script output from stdout and stderr. You can
configure the SAP HANA to record the R script outputs automatically, which subsequently can be seen in the
SAP HANA trace file.
A similar method allows you to tweak the R scripts to record part of the R script output manually, and save it in
output variables.
Related Information
Trace R Procedure Output Automatically [page 24]
Trace R Procedure Output Manually [page 27]
5.1.1 Trace R Procedure Output Automatically
Set up an output trace to debug an R procedure automatically.
Context
In SAP HANA, you find a trace component called rscript_output. If you want to record the R script output,
then set the trace level for this component either to info or to debug. You can see the output in the latest
indexserver_*.trc file when it is finished.
Perform the following steps to trace the R procedure output automatically.
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P U B L I C
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SAP HANA R Integration Guide
Debugging and Tracing