Hi Patrick, I'm also setting up a Zookeeper ensemble across three different locations and I've got some questions regarding the parameters as specified on the page you mentioned:
> That's controlled by the "tickTime"/synclimit/initlimit/etc.. see more > about this in the admin guide: http://bit.ly/c726DC - What's the difference between initLimit and syncLimit? For initLimit it says this is the time "to allow followers to connect and sync to a leader," and syncLimit is the time "to allow followers to sync with ZooKeeper". To me this sounds very similar, since "Zookeeper" in the second definition probably means the Zookeeper leader, doesn't it? - When I connect with a client to the Zookeeper ensemble I provide the three IP addresses of my three Zookeeper servers. Does the client then choose one of them arbitrarily or will it always try to connect to the first one first? I'm asking since I would like to have my clients first try to connect to the local Zookeeper server and only if that fails (for whatever reason, maybe it's down) it should try to connect to one of the servers on a different physical location. > You'll want to increase from the defaults since those are typically for > high performance interconnect (ie within colo). You are correct though, > much will depend on your env. and some tuning will be involved. Do you have any suggestions for the parameters? So far I left tickTime at 2 sec and increased initLimit and syncLimit to 30 (i.e., one minute). Our sites are connected with 1Gbit to the Internet, but of course we have no influence on what's in between. The data managed by zookeeper is quite large (snapshots are 700 MByte, but they may increase in the future). Thanks for your help, Michael -- Michael Bauland michael.baul...@knipp.de bauland.tel
