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Re: Dynamic reconfiguration - Zookeeper - [mail # user]
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...No problem! The way it works is that before a server acks a reconfig operation it writes a special tmp file to disk (dynamicConfigFilename + ".tmp"). Servers look for this file during ...
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Author: Alexander Shraer,
2012-07-28, 17:33
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Re: Dynamic reconfiguration - Zookeeper - [mail # user]
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...Hi Jared, figuring out what happened and how to recover is part of the reconfiguration protocol. I don't think that this is something you as a user should do, unless I missunderstand w...
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Author: Alexander Shraer,
2012-07-28, 17:02
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Re: Dynamic reconfiguration - Zookeeper - [mail # user]
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...Yes, this entry will be deleted. I don't like this either - if a new follower reboots before added to the config it will not be able to boot up without manual help from an admin. That's why ...
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Author: Alexander Shraer,
2012-07-28, 01:42
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Re: Dynamic reconfiguration - Zookeeper - [mail # user]
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...Yes, any number of followers which are not in the configuration can just connect and listen in. This has always been the case, also in 3.4, I just made use of this for the purpose of adding ...
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Author: Alexander Shraer,
2012-07-28, 00:55
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Re: Dynamic reconfiguration - Zookeeper - [mail # user]
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...there are just two supported types - participant and observer. (participant can act as either follower or leader). So you can either write participant or leave it unspecified (which me...
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Author: Alexander Shraer,
2012-07-28, 00:29
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Re: Dynamic reconfiguration - Zookeeper - [mail # user]
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...BTW, please don't hesitate to ask me if you have other questions or run into any issues with ZK-107 patch. On Fri, Jul 27, 2012 at 5:20 PM, Alexander Shraer wrote: ...
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Author: Alexander Shraer,
2012-07-28, 00:25
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Re: Dynamic reconfiguration - Zookeeper - [mail # user]
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...Hi Jared, Thanks for experimenting with this feature. The idea is that new servers join as "non voting followers". Which means that they act as normal followers but the leader ig...
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Author: Alexander Shraer,
2012-07-28, 00:20
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Re: quorum of 4 servers - Zookeeper - [mail # dev]
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...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 ...
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Author: Alexander Shraer,
2012-07-20, 21:37
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zookeeper reconfiguration paper - Zookeeper - [mail # dev]
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...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 ...
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Author: Alexander Shraer,
2012-05-03, 02:05
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Re: adding/removing a zookeeper server - Zookeeper - [mail # user]
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...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...
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Author: Alexander Shraer,
2012-04-30, 19:10
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