Help with Parallel Processing

Dear Friends,



I'm trying to run a bunch of tasks in parallel using 'Future' package and
for some reason, it's not able to find the data frames that I want it to
find.  I've created the below sample program to show what I'm doing.  Should
I be exporting the Global data to each child process?  I am not doing that
currently because I read somewhere that it's automatically done when using
the multisession plan.  Any idea what I'm doing wrong?



Thanks

Ravi





if(!require('sqldf')) install.packages('sqldf')

if(!require('future')) install.packages('future')

if(!require('doFuture')) install.packages('doFuture')

if(!require('future.apply')) install.packages('future.apply')



library('sqldf')

library('future')

library("doFuture")

library("future.apply")



registerDoFuture()

plan(multisession, globals = TRUE, workers=5)

options(future.globals.maxSize=+Inf)



DATA_ASIA <- data.frame(c('NAME1', 'NAME2'))

DATA_EUROPE <- data.frame(c('NAME1', 'NAME2', 'NAME3'))

DATA_USA <- data.frame(c('NAME1', 'NAME2', 'NAME3', 'NAME4'))

DATA_AFRICA <- data.frame(c('NAME1'))



LEVEL <- c('ASIA_LEVEL', 'EUROPE_LEVEL', 'USA_LEVEL', 'AFRICA_LEVEL')

R_PROG <- c('SELECT COUNT(*) as COUNT FROM DATA_ASIA',

            'SELECT COUNT(*) as COUNT FROM DATA_EUROPE',

            'SELECT COUNT(*) as COUNT FROM DATA_USA',

            'SELECT COUNT(*) as COUNT FROM DATA_AFRICA')



RULES_ALL <- data.frame(LEVEL, R_PROG)



RULES_ASIA <- subset(RULES_ALL, LEVEL == 'ASIA_LEVEL')

RESULT_ASIA <- future(data.table::rbindlist(lapply(1:nrow(RULES_ASIA),
function(x) sqldf(RULES_ASIA$R_PROG[x])), use.names = TRUE, fill=TRUE))



RULES_EUROPE <- subset(RULES_ALL, LEVEL == 'EUROPE_LEVEL')

RESULT_EUROPE <- future(data.table::rbindlist(lapply(1:nrow(RULES_EUROPE),
function(x) sqldf(RULES_EUROPE$R_PROG[x])), use.names = TRUE, fill=TRUE))



RULES_USA <- subset(RULES_ALL, LEVEL == 'USA_LEVEL')

RESULT_USA <- future(data.table::rbindlist(lapply(1:nrow(RULES_USA),
function(x) sqldf(RULES_USA$R_PROG[x])), use.names = TRUE, fill=TRUE))



RULES_AFRICA <- subset(RULES_ALL, LEVEL == 'AFRICA_LEVEL')

RESULTS_AFRICA <- future(data.table::rbindlist(lapply(1:nrow(RULES_AFRICA),
function(x) sqldf(RULES_AFRICA$R_PROG[x])), use.names = TRUE, fill=TRUE))



RESULT_ASIA <- value(RESULT_ASIA)

RESULT_EUROPE <- value(RESULT_EUROPE)

RESULT_USA <- value(RESULT_USA)

RESULTS_AFRICA <- value(RESULTS_AFRICA)









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