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zookeeper reconfig - please review - Zookeeper - [mail # dev]
...Hi All,  I've uploaded a new patch for ZK-107 which includes many more tests. While one can always do more, it seems like the patch is in a good state, and I'd appreciate it if the comm...
   Author: Alexander Shraer, 2012-08-21, 06:30
Re: Dynamic reconfiguration - Zookeeper - [mail # user]
...Yes, this way two new guys will not connect to each other because they dont k now about each other. Every quorum including a bew guy must include at least  one old guy that knows the la...
   Author: Alexander Shraer, 2012-07-29, 01:00
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
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
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
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
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
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
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