Explain "Leader/Follower" Pattern

Posted by Alex B on Stack Overflow See other posts from Stack Overflow or by Alex B
Published on 2010-06-17T01:08:31Z Indexed on 2010/06/17 1:12 UTC
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design-patterns

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I can't seem to find a good explanation of "Leader/Follower" pattern. All explanations either simply refer to it in the context of some problem, or are completely meaningless.

Can anyone explain to the the mechanics of how this pattern works, and why and how it improves performance over more traditional asynchronous IO models? Examples and links to diagrams are appreciated too.

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