No high availability on open-source. Meant to be used with partitioning in mind so if you need cross-partition transactions most of the time, it's slow.
VoltDB has fantastic HA, but yes, not in the OSS version.
You might be surprised how many apps deploy on VoltDB with cross-partition transactions making up a solid chunk of their workload. Yes, they're slower than partitioned operations, but they're still faster than MySQL much of the time.
Most of the apps we see partition very well, especially for writes. The fact that they can run 10k distributed aggregates a second to get a global view is something few other systems can touch.
