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[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
Re: Newbie design question - Zookeeper - [mail # user]
...Run an ensemble of ZK machines. Each job node just needs to use a zookeeper client library to pull jobs down. You do not want to run a large ensemble of ZK nodes unless absolutely necessary....
   Author: Camille Fournier, 2012-03-05, 14:30
[expand - 4 more] - Re: methods to figure out what causes an ephemeral node to be deleted - Zookeeper - [mail # user]
...Depends on what you're doing with the clients. I mean, within the same process it's likely that you might want to have only one connection to a given cluster, for reasons like the cause of y...
   Author: Camille Fournier, 2012-03-02, 04:05
[expand - 1 more] - Re: sync vs. async vs. multi performances - Zookeeper - [mail # user]
...True. We do have an outstanding jira that Ben filed on a perf problem in 3.4.X that could be contributing: https://issues.apache.org/jira/browse/ZOOKEEPER-1390   On Tue, Feb 14, 2012 at...
   Author: Camille Fournier, 2012-02-14, 18:38
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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