Alpha.

Conbined with https://github.com/ksarch-saas/redis and https://github.com/ksarch-saas/r3proxy:

• Multi-IDC Support, every node has a tag, never elect node in a backup region as master.
• Replication via siblings, do not resync from new master if it was our sibling.
• Builtin web console and command line tools for realtime monitor and control.
• Configurable read preferences, you can read from primary, primary_preferred or neareat region.
• Global failover constraint, if many many clusters deploy on the same machine pool, two clusters will never exec failover jobs at the same time.
• Slot rebalance.