spark-links-imp.txt

https://stackoverflow.com/questions/45553300/compare-two-spark-dataframes
https://stackoverflow.com/questions/51044725/comparing-two-dataframes-in-spark
https://stackoverflow.com/questions/47679757/compare-two-data-frames-with-the-same-schema-row-by-row
https://stackoverflow.com/questions/54213161/spark-dataframe-row-to-row-comparison
http://shzhangji.com/blog/2017/07/31/how-to-achieve-exactly-once-semantics-in-spark-streaming/
https://www.slideshare.net/HadoopSummit?utm_campaign=profiletracking&utm_medium=sssite&utm_source=ssslideview
https://knpcode.com/hadoop/hadoop-io/how-to-use-lzo-compression-in-hadoop/

https://madusudanan.com/blog/scala-tutorials-part-27-higher-order-functions/
https://dzone.com/articles/higher-order-functions-in-scala-1	
https://www.learningjournal.guru/courses/kafka/kafka-foundation-training/producer-workflow/
http://kavita-ganesan.com/reading-csv-and-json-files-in-spark/#.XUAcqegzbIW
https://training.databricks.com/visualapi.pdf

https://docs-snaplogic.atlassian.net/wiki/spaces/SD/pages/2556313/Column+Functions+and+Properties+Spark+SQL

https://mungingdata.com/apache-spark/dealing-with-null/
https://blog.clairvoyantsoft.com/
https://stackoverflow.com/questions/29383107/how-to-change-column-types-in-spark-sqls-dataframe
http://sqlandhadoop.com/spark-dataframe-like-not-like-rlike/
http://sqlandhadoop.com/spark-dataframe-alias-as/
http://sqlandhadoop.com/spark-dataframe-aggregate-functions/
http://sqlandhadoop.com/spark-dataframe-where-filter/
https://github.com/minio/spark-select/tree/master/src/main/scala/io/minio/spark/select
https://docs.microsoft.com/en-us/azure/hdinsight/spark/apache-spark-perf