avoid intermittent SIGTERM socket rscript error caused by concurrent requests with no backlog
avoid intermittent SIGTERM socket rscript error caused by concurrent requests with no backlog

rstudio/sparklyr,rstudio/sparklyr,kevinykuo/sparklyr,rstudio/sparklyr,rstudio/sparklyr,kevinykuo/sparklyr,kevinykuo/sparklyr,kevinykuo/sparklyr