Thursday, October 3, 2013

QAing New Code with MMS: Map/Reduce vs. Aggregation Framework

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When releasing software, most teams focus on correctness, and rightly so. But great teams also QA their code for performance. MMS Monitoring can also be used to quantify the effect of code changes on your MongoDB database. Our staging environment is an exact mirror of our production environment, so we can test code in staging to reveal performance issues that are not evident in development. We take code changes to staging, where we pull data from MMS to determine if feature X will impact performance.

As a working example, we can use MMS to calculate views across a day using both Map/Reduce and the aggregation framework to compare on their performance and how they affect overall DB performance.

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