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https://issues.apache.org/jira/browse/ZOOKEEPER-1508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13412242#comment-13412242
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Flavio Junqueira commented on ZOOKEEPER-1508:
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Bill and I have been having discussions offline about this feature. I like it a
lot and I think we should do it. One question I have is if this diverges enough
from the current project that it warrants a new subproject.
> Reliable standalone mode through redundant databases
> ----------------------------------------------------
>
> Key: ZOOKEEPER-1508
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1508
> Project: ZooKeeper
> Issue Type: New Feature
> Environment: Single server with multiple disks or two node cluster
> with multiple shared disks
> Reporter: Bill Bridge
>
> Currently ZooKeeper requires 3 servers to provide both reliability and
> availability. This is fine for large internet scale clusters, but there are
> lots of two node clusters that could benefit from ZooKeeper. There are also
> single server use cases where it is highly desirable to have ZooKeeper
> survive a disk failure, but availability is not as important.
> This feature would allow the configuration of multiple destinations for logs
> and snapshots. A transaction is committed when a majority of the log writes
> complete successfully. If one log gets an error on write, then it is taken
> offline until an administrator brings it online or replaces it with a new
> destination. ZooKeeper continues to run as long as a quorum of disks can be
> written.
> High availability can be provided with a two node cluster. When the ZooKeeper
> node dies, the disks are switched to the surviving node and a new ZooKeeper
> starts. Faster switch over can be done if there is an observer already
> running in the new node.
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