ignore unregister execptions and avoid unregistering workers since they are not registered
ignore unregister execptions and avoid unregistering workers since they are not registered

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