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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
Re: Please vote for ZOOKEEPER-107 to be presented in the Hadoop Summit - Zookeeper - [mail # dev]
...Congrats alex that's great news!  C  On Apr 4, 2012 1:51 AM, "Alexander Shraer"  wrote:  nd-operations...
   Author: Camille Fournier, 2012-04-04, 13:46
Re: Ephemeral deletion order - Zookeeper - [mail # user]
...We associate ephemerals to the session id via a HashSet, so the watches will be triggered in the order items are returned from the HashSet, which is practically, undefined.  C  On ...
   Author: Camille Fournier, 2012-03-20, 02:18
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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