Reliably replicate items between instances, runs as daemon that auto-updates itself configuration. Reads queue from backpack-coordinator and does what it says.
Use values from your backpack-coordinator.
Usage: backpack-replicator <zk_servers> </zk/root> [concurrency]
concurrency is the number of items that replicator will process in parallel.
Initial configuration is stored in zookeeper. When zookeeper data changes, backpack-replicator automatically reload and apply new configuration so there's no need for manual restarts.