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Merge pull request #161 from philips/add-faq-section

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feat(README): add note about cluster size
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Xiang Li 2013-09-07 10:27:14 -07:00
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@ -497,6 +497,19 @@ If you are using SSL for server to server communication, you must use it on all
- [mattn/etcd-vim](https://github.com/mattn/etcd-vim) - SET and GET keys from inside vim
- [mattn/etcdenv](https://github.com/mattn/etcdenv) - "env" shebang with etcd integration
## FAQ
### What size cluster should I use?
Every command the client sends to the master is broadcast it to all of the followers.
But, the command is not be committed until the majority of the cluster machines receive that command.
Because of this majority voting property the ideal cluster should be kept small to keep speed up and be made up of an odd number of machines.
Odd numbers are good because if you have 8 machines the majority will be 5 and if you have 9 machines the majority with be 5.
The result is that an 8 machine cluster can tolerate 3 machine failures and a 9 machine cluster can tolerate 4 nodes failures.
And in the best case when all 9 machines are responding the cluster will perform at the speed of the fastest 5 nodes.
## Project Details
### Versioning