Hashtable vs ConcurrentDictionary

Historically I've seen the Hashtable be favored over ConcurrentDictionary with the assumption that is was more efficient allowing for lock free reads. Well they both allow lock free reads so which one is really the better option?

Circuit Breaker Summary

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Circuit Breaker on rate

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Circuit Breaker on concurrency

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Circuit Breaker on failure rate

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Circuit Breaker on number of failures in time window

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Circuit Breaker on consecutive failures

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The Circuit Breaker Pattern

I don't remember where I first heard about the circuit breaker pattern but I had seen it a few times in a few different forms under different names. Over time I have come to believe that the original approach described to me might not be the most appropriate.

2013 statistics

Since I decided to move the blog during 2013 the statistics for 2013 are split between two sites and I'll do this a little different than last year.

TFS Anti-Patterns: Copying work items

Over my years at Microsoft I have encountered what I'd like to call the work item copy anti pattern.