What is the difference between COALESCE() and ISNULL()?

Both functions are used to return the first not null value among all the input values passed. ISNULL(): It takes only two parameters. ISNULL() is T – SQL specific function. The return data type of ISNULL() is the datatype of the first

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How to change the file cached by Distributed Cache?

Distributed Cache in MapReduce can be updated by replacing the file with the new one and changing the pointer location to point to new location and restart the MapReduce job or by appending the values in Distributed cache and restarting the job.

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