Spark context cleaner - animeshtrivedi/notes GitHub Wiki

https://jaceklaskowski.gitbooks.io/mastering-apache-spark/content/spark-service-contextcleaner.html

https://jaceklaskowski.gitbooks.io/mastering-apache-spark/content/spark-service-contextcleaner.html#periodicGCService

https://databricks.com/blog/2015/05/28/tuning-java-garbage-collection-for-spark-applications.html

https://stackoverflow.com/questions/35515120/why-does-sparkcontext-randomly-close-and-how-do-you-restart-it-from-zeppelin

spark.cleaner.periodicGC.interval       5s
spark.cleaner.referenceTracking.blocking        false 
spark.cleaner.referenceTracking.blocking.shuffle        false