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Nix: Change Default Shell For A User

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You can change the default shell program for a particular unix user with the chsh command. Just tell it what shell program you want to use (e.g. bash or zsh)...

Spark: Orderby Partitioning

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Remember that orderBy uses the number of partitions specified by spark.conf.get("spark.sql.shuffle.partitions"). The default for this is 200. Can change manu...


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Awesome work to demonstrate how to deliberately cause a SHA-1 collision.