Small collection of programs to test ZooKeeper's scalability

This prog spawns N clients, each of which will call:

getChildren(path, watch: true)

for the given path, setting a watch as well. Every time the watch fires, the call will be reissued (thus, resetting the watch). Depending on how you'd like to run this, you can distribute the creation of clients among a given set of processes. For example, to create 10k clients with 1k clients per process you can do:

$ ./get-children-with-watch --num-clients 1000 --num-procs 10 --watched-paths / localhost:2181

By default, each (child) process will start 4 (additional) threads:

• a client creator thread that will exit once it's done creating clients
• a poller thread (which calls epoll() to check on the sockets)
• an interests thread (which calls zookeeper_interests() on handlers to check for pings and such)
• a worker thread which will call zookeeper_process() when the epoll() thread indicates (through a queue) that there is work to be done

If you want more worker threads (i.e.: because of slow network), you can try:

$ ./get-children-with-watch --num-clients 1000 --num-procs 10 --num-workers 5 --watched-paths / localhost:2181

To check the full set of available pararmeters use (surprise surprise):

$ ./get-children-with-watch --help