code questions

code answers

• in spark streaming must i call count() after cache() or persist() to force caching/persistence to really happen?
• Multiple apps are getting submitted to spark Cluster and keeps in waiting and then exits withError
• Converting Dataframe to RDD reduces partitions
• calculate co-occurrence terms with spark using scala
• remove empty strings from spark RDD
• increase task size spark [duplicate]
• Caching strategy for personalized feeds
• jdbc : Could not create connection to database server [duplicate]
• ERROR ContextCleaner: Error in cleaning thread
• spark on yarn run double times when error [duplicate]