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Re: Zookeeper Leader Election Preference - Zookeeper - [mail # user]
...When I was doing a similar thing, we would start the 2 nodes in the primary first (which will get a leader elected), then start the 3rd in the backup. We also had a script set up to monitor ...
   Author: Camille Fournier, 2012-07-03, 19:28
Re: How to start multiple servers - Zookeeper - [mail # dev]
...What are you trying to do? If you're just trying to start multiple nodes for testing purposes, I recommend you glance at the source code for the ZK tests themselves, which do this often. &nb...
   Author: Camille Fournier, 2012-06-24, 13:39
Re: Is ZooKeeper the right tool for our needs? - Zookeeper - [mail # user]
...You seed the client with the list of servers to connect to. If you only seed it with one server, it will only connect to one server even if there are others in the quorum, so this should not...
   Author: Camille Fournier, 2012-06-04, 22:23
[expand - 4 more] - Re: Distribution Problems With Multiple Zookeeper Clients - Zookeeper - [mail # user]
...Again, if you want your clients to perform equal work, you need to balance when they will take jobs with how many jobs they are currently processing. If instance1 is doing 100 jobs and it sh...
   Author: Camille Fournier, 2012-05-25, 17:58
Re: How to recover previous watcher & event after "session expired" - Zookeeper - [mail # user]
...I'm not sure what you mean in question #1. A session expired event generally causes the client to become completely invalid, you could wrap the client in your own logic to record what you we...
   Author: Camille Fournier, 2012-05-18, 22:20
[expand - 2 more] - Re: Possible issue with cluster availability following new Leader Election - ZK 3.4 - Zookeeper - [mail # dev]
...This pretty much matches what I expect. It would be great if you wanted to try your hand at creating a patch and submitting it to the ticket that was created for this problem, but if not, pl...
   Author: Camille Fournier, 2012-05-17, 02:50
[expand - 2 more] - Re: ZK to coordinate across data centers - Zookeeper - [mail # dev]
...You can't do ZK guaranteed live at all times across an even number of data centers. If you want to guarantee quorum even if you lose a datacenter you need an odd number of datacenters for yo...
   Author: Camille Fournier, 2012-05-09, 20:46
Re: Ephermal node and notifications for stateless sessions - Zookeeper - [mail # dev]
...In what you're describing, your service creates ephemeral nodes on behalf of its clients, and has to track the clients liveness. You're redoing a lot of the logic ZK would handle for you if ...
   Author: Camille Fournier, 2012-05-08, 14:29
[expand - 1 more] - Re: How to replace a zookeeper server ? - Zookeeper - [mail # user]
...Agreed that just restarting is probably the easiest way to go. I'm trying to reason how to do this with a rolling restart without any downtime at all, and I'm not 100% sure that is safely po...
   Author: Camille Fournier, 2012-04-18, 14:04
[expand - 4 more] - Re: Input on a change - Zookeeper - [mail # user]
...I've done extensive ZK client testing mostly using mocks with great success. I agree that there's cases when embedding a ZK is probably the easiest way to go, but it is actually much easier ...
   Author: Camille Fournier, 2012-04-16, 18:40
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB