Switches the execution platform between the local host and the Hadoop cluster. No changes in the R code are required for a dry run.
Set to TRUE
to run a MapReduce program locally, or FALSE
to run the program on the Hadoop cluster.
The orch.dryrun
function enables you to run a MapReduce program locally on a laptop using a small data set before running it on a Hadoop cluster using a very large data set. The mappers and reducers are run sequentially on row streams from HDFS. The Hadoop cluster is not required for a dry run.