--- Comment #13 from Sean Pringle <> ---
Much better than it was.

I'm now trialing partitioned logging tables on one slave per production shard
and directing these queries to those boxes. Since most of the queries use
log_user = N, partitioning on key(log_user) allows the optimizer to use
partition pruning.

Still have to track down and sort out the ones without log_user = N. They're
infrequent and low priority.

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