Recent Percona XtraDB Cluster optimizations have exposed fc_limit contention. It was always there, but was never exposed as the Commit Monitor contention was more significant. As it happens with any optimization, once we solve the bigger contention issues, smaller contention issues start popping up. We have seen this pattern in InnoDB, and Percona XtraDB Cluster is no exception. In fact, it is good because it tells us that we are on the right track.
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