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Displaying posts with tag: prefetch (reset)
on MySQL replication prefetching

For the impatient ones, or ones that prefer code to narrative, go here. This is long overdue anyway, and Yoshinori already beat me, hehe…

Our database environment is quite busy – there’re millions of row changes a second, millions of I/O operations a second and impact of that can be felt at each shard. Especially, as we also have to replicate to other datacenters, single threaded replication on MySQL becomes a real bottleneck.

We use multiple methods to understand and analyze replication lag composition – a simple replication thread state sampling via MySQL processlist helps to understand logical workload components (and work in that field yields great results), and pstack/GDB …

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