Guo questions

• what's the difference of two functions in Scala?
• Does spark streaming must finish processing previous batch of data, and then it can process the next batch of data, is it right?
• scala: How to know the program have unhandled exceptions before running?
• How to custom code folding for Scala in intelliJ IDEA?
• What is DFS in Elasticsearch "DFS_QUERY_THEN_FETCH"?
• Scala: How to use case keyword without match keyword?
• Scala: what is trait TraversableOnce? What's the different between TraversableOnce and Traversable?
• How many RDDs does DStream generate for a batch interval?
• What's the meaning of DStream.foreachRDD function?

Guo answers