user: Which of the following numbers is a real number: -200, -1.5, -1, 0, 1, 1.5, 200, pi, e, sqrt(-1)?

assistant: The real numbers among those are -200, -1.5, -1, 0, 1, 1.5, 200, pi, e

user: How many times did Gordie Howe retire?

assistant: Based on the provided information, Howe retired two times.

Howe retired for the first time in 1971, but then later joined his sons Mark and Marty on the Houston Aeros of the WHA. Howe would then return to the NHL in 1979 where he played one season before retiring for a second time.

user: What is the difference between coalesce and repartition when it comes to shuffle partitions in spark

assistant: Coalesce essentially groups multiple partitions into a larger partitions. So use coalesce when you want to reduce the number of partitions (and also tasks) without impacting sort order.  Ex:- when you want to write-out a single CSV file output instead of multiple parts


Use repartition when you want to cause a shuffle that changes the number of partitions.  A common use-case for repartition is to remove skew in file sizes or to start out with a smaller/different number of partitions than the default in Spark