| unpersist {SparkR} | R Documentation | 
Mark this DataFrame as non-persistent, and remove all blocks for it from memory and disk.
## S4 method for signature 'DataFrame' unpersist(x, blocking = TRUE)
| x | The DataFrame to unpersist | 
| blocking | Whether to block until all blocks are deleted | 
## Not run: 
##D sc <- sparkR.init()
##D sqlContext <- sparkRSQL.init(sc)
##D path <- "path/to/file.json"
##D df <- jsonFile(sqlContext, path)
##D persist(df, "MEMORY_AND_DISK")
##D unpersist(df)
## End(Not run)