DPM questions

DPM answers

• RDD.union vs SparkContex.union
• Garbage collection on intern'd strings, String Pool, and perm-space
• How do you perform blocking IO in apache spark job?
• How to convince Java Garbage Collector to run when working set is small?
• apache spark - check if file exists
• List with amortized constant or logarithmic insertion: how fast can possibly be lookup?
• Query REST web service with Apache Spark?