How often does the fencing data change? If it's infrequent I wonder if you could load the data on start up and simply restart nodes to refresh the data. That wo

How often does the fencing data change? If it's infrequent I wonder if you could load the data on start up and simply restart nodes to refresh the data. That would avoid a mutex lock entirely. However, a mutex lock/unlock should take <100ns. It doesn't seem like that should be a bottleneck. It'd be interesting to hear more about the data, requirements, and response times (median, 90%, etc).