I have a MapReduce job that is calculating metrics around a customer through time (for each month that they are a customer with our company). Once completed the access pattern will likely be by year and month, so I was thinking that I should create a partition based on that. I'm new to the custom partitioning stuff and what I'm reading is the partition step comes before the reduce step (which I need the key to be customer id). I'm wondering if there is a way to create the partition after the reduce step without creating a new MapReduce job afterward. Thanks,
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