Sublime

During shuffling the answers from the map steps are distributed through hashing so that the same key words end up on the same reduce node. For example, in a simple situation there would be 26 reduce nodes so that all the words beginning with A go to one node, all the B’s go to another, all the C’s go to another, and so on.

A map is an unordered collection of key-value pairs (maps are also sometimes called associative arrays, hash tables, or dictionaries). Maps are used to look up a value by its associated key. Here’s an example of a map in Go: var x map[string]int The map type is represented by the keyword map, followed by the key type in brackets and finally the val

On the other hand, if you just access a map element that isn’t in the list using the normal bracket operation: name_to_email[ "John Doe" ];