Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/1309
@snowch Not sure how much dumping out the R command would help diagnose. Do
you meet any case that failed to launch the R process ? If you want to diagnose
the R process after it is launched. You can refer SparkOutputStream which will
print output in debug level. You just need add the following line in
log4j.properties.
```
log4j.logger.org.apache.zeppelin.spark.SparkOutputStream=DEBUG
```
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