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Re: quorum of 4 servers - Zookeeper - [mail # dev]
...Hi Ted,  It is always OK to have an even number of servers. The thing is that 4 servers is not more fault-tolerant than 3 servers - both allow only 1 failure. It may still be better in ...
   Author: Alexander Shraer, 2012-07-20, 21:37
zookeeper reconfiguration paper - Zookeeper - [mail # dev]
...Hi All,  Our paper about dynamic reconfiguration of ZooKeeper  (ZK-107) will soon appear in the USENIX ATC 2012 conference. If you're interested in this, you can find the paper on ...
   Author: Alexander Shraer, 2012-05-03, 02:05
[expand - 1 more] - Re: adding/removing a zookeeper server - Zookeeper - [mail # user]
...exactly - ZK-107 allows fully automatic reconfiguration without any restarts (it adds this as an API command to zookeeper). We also have a mechanism to rebalance clients across the new set o...
   Author: Alexander Shraer, 2012-04-30, 19:10
[expand - 1 more] - Re: Please vote for ZOOKEEPER-107 to be presented in the Hadoop Summit - Zookeeper - [mail # dev]
...Thanks everyone for voting! With > 200 votes this project won the popularity contest in its track and will presented it in the Hadoop Summit!!   Alex   On Mon, Mar 12, 2012 at 3...
   Author: Alexander Shraer, 2012-04-04, 05:50
Re: Sequential znode creation and sync - Zookeeper - [mail # user]
...Hi Luca,  The whole tree -- when an update (such as create) returns the local server's tree reflects all the updates scheduled before the create.  Alex  On Sun, Mar 18, 2012 a...
   Author: Alexander Shraer, 2012-03-19, 05:33
[expand - 4 more] - Re: Zookeeper on short lived VMs and ZOOKEEPER-107 - Zookeeper - [mail # user]
...I think this is why when you're doing rolling restarts / reconfiguration you should never have two different servers that have any chance of being up at the same time with the same id. With ...
   Author: Alexander Shraer, 2012-03-16, 18:37
[expand - 1 more] - RE: Rolling upgrades - Zookeeper - [mail # user]
...I don't think they must be an odd number, but it does make sense to have an  odd number because with majority quorums the fault tolerance you get with 3 servers is  the same as the...
   Author: Alexander Shraer, 2012-03-09, 00:15
[expand - 2 more] - RE: Possibility / consequences of having multiple elected leaders - Zookeeper - [mail # user]
...Thanks Ted, I can see your point. We use TCP connections and we do the epoch check at the beginning of the protocol, so a message from an old leader cannot just resurface.  Alex  F...
   Author: Alexander Shraer, 2012-03-08, 23:09
Re: Setting Zookeeper server cluster on single host - Zookeeper - [mail # user]
...you need to have a different set of ports for each server in the config files. Otherwise ports 5181 and 5888 just get taken by the first server...  server.1=127.0.0.1:5181:5887 server.2...
   Author: Alexander Shraer, 2012-03-07, 15:12
RE: Branch for reconfiguration (ZOOKEEPER-107)? - Zookeeper - [mail # dev]
...Hi Flavio,  I've been basically working on my own branch for many months now. The probl em is that the main trunk is changing all the time, and of course the merge is difficu lt as you ...
   Author: Alexander Shraer, 2012-01-20, 18:47
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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